diff --git a/app/models/work_package.rb b/app/models/work_package.rb
index b80a5ef94274..bb8057560ed9 100644
--- a/app/models/work_package.rb
+++ b/app/models/work_package.rb
@@ -281,7 +281,7 @@ def to_s
 
   def infoline(show_standard_type: true)
     type_name = show_standard_type || !type.is_standard ? type.name : ""
-    "#{type_name}: #{subject} (##{id})"
+    "#{type_name}: #{subject} (#{formatted_id})"
   end
 
   # Return true if the work_package is closed, otherwise false
diff --git a/spec/models/work_package_spec.rb b/spec/models/work_package_spec.rb
index 9d5262b9a35d..e797d5075e05 100644
--- a/spec/models/work_package_spec.rb
+++ b/spec/models/work_package_spec.rb
@@ -915,4 +915,32 @@ def stub_shared_versions(version = nil)
       end
     end
   end
+
+  describe "#infoline" do
+    let(:infoline_type) { create(:type, name: "Task") }
+    let(:infoline_work_package) do
+      create(:work_package, subject: "Hello world", project: infoline_project, type: infoline_type)
+    end
+
+    context "when semantic mode is active",
+            with_flag: { semantic_work_package_ids: true },
+            with_settings: { work_packages_identifier: "semantic" } do
+      let(:infoline_project) { create(:project, identifier: "MYPROJ") }
+
+      before { infoline_work_package }
+
+      it "renders the semantic identifier without a hash prefix" do
+        expect(infoline_work_package.reload.infoline).to eq("Task: Hello world (MYPROJ-1)")
+      end
+    end
+
+    context "when semantic mode is not active",
+            with_flag: { semantic_work_package_ids: false } do
+      let(:infoline_project) { create(:project) }
+
+      it "renders the hash-prefixed numeric id" do
+        expect(infoline_work_package.infoline).to eq("Task: Hello world (##{infoline_work_package.id})")
+      end
+    end
+  end
 end