diff --git a/src/install/lockfile/Package.rs b/src/install/lockfile/Package.rs
index da74ede1d3b9..c313da5b5cfc 100644
--- a/src/install/lockfile/Package.rs
+++ b/src/install/lockfile/Package.rs
@@ -111,6 +111,26 @@ pub(crate) fn value_loc_of(source: &bun_ast::Source, key_loc: bun_ast::Loc) -> b
     crate::bun_json::property_value_loc(&source.contents, key_loc).unwrap_or(key_loc)
 }
 
+/// True when `folder`, a folder-dependency path relative to the workspace
+/// root (either platform's separators), names the directory of the member
+/// registered at `workspace_path` (posix).
+fn folder_path_is_workspace_path(folder: &[u8], workspace_path: &[u8]) -> bool {
+    let mut buf = path::path_buffer_pool::get();
+    let normalized = resolve_path::join_string_buf::<path::platform::Auto>(&mut buf[..], &[folder]);
+    if normalized.len() != workspace_path.len() {
+        return false;
+    }
+    if cfg!(windows) {
+        for (&a, &b) in normalized.iter().zip(workspace_path) {
+            if a != b && !(a == b'\\' && b == b'/') {
+                return false;
+            }
+        }
+        return true;
+    }
+    strings::eql(normalized, workspace_path)
+}
+
 #[cold]
 fn invalid_trusted_dependencies(
     log: &mut bun_ast::Log,
@@ -1748,6 +1768,36 @@ impl Package<u64> {
                 // if relative is empty, we are linking the package to itself
                 dependency_version.value.folder = string_builder
                     .append::<String>(if relative.is_empty() { b"." } else { relative });
+
+                // The root package's dependencies share one node_modules
+                // entry per name with the workspace members, so a root folder
+                // dependency colliding with a member resolves to the member,
+                // as in npm. Both placed side by side would serialize the
+                // same bun.lock key twice.
+                if let Some(workspace_path) = workspace_path {
+                    let collides = package_dependencies[0..dependencies_count as usize]
+                        .iter()
+                        .any(|dep| dep.name_hash == name_hash && dep.behavior.is_workspace());
+                    if collides
+                        && !folder_path_is_workspace_path(relative, workspace_path.slice(buf))
+                    {
+                        let path = workspace_path.sliced(buf);
+                        if let Some(mut dep) = dependency::parse_with_tag(
+                            external_alias.value,
+                            Some(external_alias.hash),
+                            path.slice,
+                            dependency::version::Tag::Workspace,
+                            &path,
+                            Some(&mut *log),
+                            Some(&mut *pm),
+                        ) {
+                            // Whole-struct move so `Drop` frees the old
+                            // chain; keep the existing `literal`.
+                            dep.literal = dependency_version.literal;
+                            dependency_version = dep;
+                        }
+                    }
+                }
             }
             dependency::version::Tag::Npm => {
                 if let Some(workspace_version) = workspace_version {
diff --git a/test/cli/install/bun-workspaces.test.ts b/test/cli/install/bun-workspaces.test.ts
index 8892276eaf73..13d683716bf2 100644
--- a/test/cli/install/bun-workspaces.test.ts
+++ b/test/cli/install/bun-workspaces.test.ts
@@ -278,6 +278,205 @@ test("dependency on same name as workspace and dist-tag", async () => {
   ]);
 });
 
+describe("workspace and file: dependency sharing a name", () => {
+  // A root `file:` dependency and a same-named workspace member share one
+  // root node_modules entry. The member wins and the dependency resolves to
+  // it, as in npm. Both used to be placed side by side, writing duplicate
+  // bun.lock keys that broke --frozen-lockfile.
+
+  test.concurrent("resolves to the member and the lockfile round-trips", async () => {
+    using ctx = await setupTest();
+    const { packageDir, env } = ctx;
+    await Promise.all([
+      write(
+        join(packageDir, "package.json"),
+        JSON.stringify({
+          name: "sandbox",
+          version: "1.0.0",
+          workspaces: ["packages/*"],
+          dependencies: { alpha: "file:./vendor/alpha" },
+        }),
+      ),
+      write(join(packageDir, "packages", "alpha", "package.json"), JSON.stringify({ name: "alpha" })),
+      write(join(packageDir, "vendor", "alpha", "package.json"), JSON.stringify({ name: "alpha", version: "2.0.0" })),
+    ]);
+
+    await runBunInstall(env, packageDir);
+
+    const lockfile = await file(join(packageDir, "bun.lock")).text();
+    expect(lockfile.match(/"alpha": \[/g)).toHaveLength(1);
+    expect(lockfile).toContain(`"alpha": ["alpha@workspace:packages/alpha"]`);
+    expect(lockfile).not.toContain("alpha@file:");
+    expect(await file(join(packageDir, "node_modules", "alpha", "package.json")).json()).toEqual({
+      name: "alpha",
+    });
+
+    const second = await runBunInstall(env, packageDir, { savesLockfile: false });
+    expect(second.err).not.toContain("Saved lockfile");
+    expect(await file(join(packageDir, "bun.lock")).text()).toBe(lockfile);
+
+    await runBunInstall(env, packageDir, { frozenLockfile: true });
+  });
+
+  test.concurrent("member with its own dependencies still resolves them", async () => {
+    using ctx = await setupTest();
+    const { packageDir, env } = ctx;
+    await Promise.all([
+      write(
+        join(packageDir, "package.json"),
+        JSON.stringify({
+          name: "sandbox",
+          version: "1.0.0",
+          workspaces: ["packages/*"],
+          dependencies: { alpha: "file:./vendor/alpha" },
+        }),
+      ),
+      write(
+        join(packageDir, "packages", "alpha", "package.json"),
+        JSON.stringify({
+          name: "alpha",
+          version: "1.0.0",
+          dependencies: { "alpha-dep": "file:../../vendor/alpha-dep" },
+        }),
+      ),
+      write(
+        join(packageDir, "packages", "beta", "package.json"),
+        JSON.stringify({ name: "beta", version: "1.0.0", dependencies: { alpha: "workspace:*" } }),
+      ),
+      write(join(packageDir, "vendor", "alpha", "package.json"), JSON.stringify({ name: "alpha", version: "2.0.0" })),
+      write(
+        join(packageDir, "vendor", "alpha-dep", "package.json"),
+        JSON.stringify({ name: "alpha-dep", version: "3.0.0" }),
+      ),
+    ]);
+
+    await runBunInstall(env, packageDir);
+
+    const lockfile = await file(join(packageDir, "bun.lock")).text();
+    expect(lockfile.match(/"alpha": \[/g)).toHaveLength(1);
+    expect(lockfile).toContain(`"alpha": ["alpha@workspace:packages/alpha"]`);
+    expect(lockfile).not.toContain("alpha@file:");
+    expect(await file(join(packageDir, "node_modules", "alpha", "package.json")).json()).toEqual({
+      name: "alpha",
+      version: "1.0.0",
+      dependencies: { "alpha-dep": "file:../../vendor/alpha-dep" },
+    });
+    expect(
+      await file(join(packageDir, "node_modules", "alpha", "node_modules", "alpha-dep", "package.json")).json(),
+    ).toEqual({
+      name: "alpha-dep",
+      version: "3.0.0",
+    });
+
+    const second = await runBunInstall(env, packageDir, { savesLockfile: false });
+    expect(second.err).not.toContain("Saved lockfile");
+    expect(await file(join(packageDir, "bun.lock")).text()).toBe(lockfile);
+
+    await runBunInstall(env, packageDir, { frozenLockfile: true });
+  });
+
+  test.concurrent("file: dependency folder depending back on the member", async () => {
+    using ctx = await setupTest();
+    const { packageDir, env } = ctx;
+    await Promise.all([
+      write(
+        join(packageDir, "package.json"),
+        JSON.stringify({
+          name: "sandbox",
+          version: "1.0.0",
+          workspaces: ["packages/*"],
+          dependencies: { alpha: "file:./vendor/alpha" },
+        }),
+      ),
+      write(join(packageDir, "packages", "alpha", "package.json"), JSON.stringify({ name: "alpha", version: "1.0.0" })),
+      write(
+        join(packageDir, "vendor", "alpha", "package.json"),
+        JSON.stringify({ name: "alpha", version: "2.0.0", dependencies: { alpha: "workspace:*" } }),
+      ),
+    ]);
+
+    await runBunInstall(env, packageDir);
+
+    const lockfile = await file(join(packageDir, "bun.lock")).text();
+    expect(lockfile.match(/"alpha": \[/g)).toHaveLength(1);
+    expect(lockfile).toContain(`"alpha": ["alpha@workspace:packages/alpha"]`);
+    expect(lockfile).not.toContain("alpha@file:");
+    expect(lockfile).not.toContain("alpha/alpha");
+
+    const second = await runBunInstall(env, packageDir, { savesLockfile: false });
+    expect(second.err).not.toContain("Saved lockfile");
+    expect(await file(join(packageDir, "bun.lock")).text()).toBe(lockfile);
+
+    await runBunInstall(env, packageDir, { frozenLockfile: true });
+  });
+
+  test.concurrent.each(["relative", "absolute"])(
+    "%s file: dependency naming the member's directory still links the member",
+    async kind => {
+      using ctx = await setupTest();
+      const { packageDir, env } = ctx;
+      const literal = kind === "absolute" ? `file:${join(packageDir, "packages", "alpha")}` : "file:./packages/alpha";
+      await Promise.all([
+        write(
+          join(packageDir, "package.json"),
+          JSON.stringify({
+            name: "sandbox",
+            version: "1.0.0",
+            workspaces: ["packages/*"],
+            dependencies: { alpha: literal },
+          }),
+        ),
+        write(
+          join(packageDir, "packages", "alpha", "package.json"),
+          JSON.stringify({ name: "alpha", version: "1.0.0" }),
+        ),
+      ]);
+
+      await runBunInstall(env, packageDir);
+
+      const lockfile = await file(join(packageDir, "bun.lock")).text();
+      expect(lockfile.match(/"alpha": \[/g)).toHaveLength(1);
+      expect(lockfile).toContain(`"alpha": ["alpha@workspace:packages/alpha"]`);
+      expect(lockfile).not.toContain("alpha@file:");
+      expect(await file(join(packageDir, "node_modules", "alpha", "package.json")).json()).toEqual({
+        name: "alpha",
+        version: "1.0.0",
+      });
+    },
+  );
+
+  test.concurrent("aliased file: dependency colliding with another member's name", async () => {
+    using ctx = await setupTest();
+    const { packageDir, env } = ctx;
+    await Promise.all([
+      write(
+        join(packageDir, "package.json"),
+        JSON.stringify({
+          name: "sandbox",
+          version: "1.0.0",
+          workspaces: ["packages/*"],
+          dependencies: { beta: "file:./vendor/alpha" },
+        }),
+      ),
+      write(join(packageDir, "packages", "beta", "package.json"), JSON.stringify({ name: "beta", version: "1.0.0" })),
+      write(join(packageDir, "vendor", "alpha", "package.json"), JSON.stringify({ name: "alpha", version: "2.0.0" })),
+    ]);
+
+    await runBunInstall(env, packageDir);
+
+    const lockfile = await file(join(packageDir, "bun.lock")).text();
+    expect(lockfile.match(/"beta": \[/g)).toHaveLength(1);
+    expect(lockfile).toContain(`"beta": ["beta@workspace:packages/beta"]`);
+    expect(lockfile).not.toContain("@file:");
+    expect(await file(join(packageDir, "node_modules", "beta", "package.json")).json()).toEqual({
+      name: "beta",
+      version: "1.0.0",
+    });
+
+    await runBunInstall(env, packageDir, { frozenLockfile: true });
+  });
+});
+
 test.concurrent("successfully installs workspace when path already exists in node_modules", async () => {
   using ctx = await setupTest();
   const { packageDir, env } = ctx;