diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index d70ad2861..54de7ca06 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -562,7 +562,7 @@ jobs:
         shell: msys2 {0}
         run: |
           echo "ccachedir=$(cygpath -m $(${CCACHE} -k cache_dir))" >> $GITHUB_OUTPUT
-          echo "key=ccache:msvc:${{ github.ref }}:$(date +"%Y-%m-%d_%H-%M-%S"):${{ github.sha }}" >> $GITHUB_OUTPUT
+          echo "key=ccache:msvc:${{ matrix.openmp }}:${{ github.ref }}:$(date +"%Y-%m-%d_%H-%M-%S"):${{ github.sha }}" >> $GITHUB_OUTPUT
 
       - name: restore ccache
         # Setup the GitHub cache used to maintain the ccache from one job to the next
@@ -572,8 +572,8 @@ jobs:
           key: ${{ steps.ccache-prepare.outputs.key }}
           # Prefer caches from the same branch. Fall back to caches from the dev branch.
           restore-keys: |
-            ccache:msvc:${{ github.ref }}
-            ccache:msvc
+            ccache:msvc:${{ matrix.openmp }}:${{ github.ref }}
+            ccache:msvc:${{ matrix.openmp }}
 
       - name: configure ccache
         # Limit the maximum size and switch on compression to avoid exceeding the total disk or cache quota.