diff --git a/.github/workflows/build-rtools.yml b/.github/workflows/build-rtools.yml
index a01703471b3..36624bd3a53 100644
--- a/.github/workflows/build-rtools.yml
+++ b/.github/workflows/build-rtools.yml
@@ -1,6 +1,9 @@
 name: rtools
 on:
   workflow_call:
+  pull_request:
+    branches:
+      - main
 
 jobs:
   build:
@@ -37,6 +40,7 @@ jobs:
           r-version: '4.3'
       - name: Install RTools dependencies
         run: |
+          pacman-key --refresh-keys
           pacman -Sy --noconfirm base-devel
         shell: c:\rtools43\usr\bin\bash.exe --login {0}
       - name: Build TileDB