diff --git a/.github/workflows/build-xserver.yml b/.github/workflows/build-xserver.yml
index 6b5eb71de7..10542247dc 100644
--- a/.github/workflows/build-xserver.yml
+++ b/.github/workflows/build-xserver.yml
@@ -159,7 +159,7 @@ jobs:
                     ${{ env.X11_PREFIX }}
                     ${{ env.X11_BUILD_DIR }}/xts
                     ${{ env.X11_BUILD_DIR }}/piglit
-                key: ${{ runner.name }}-x11-deps-${{ hashFiles('.github/scripts/install-prereq.sh') }}
+                key: ${{ runner.name }}-x11-deps-${{ hashFiles('.github/scripts/mingw32/cross-prereqs-build.sh') }}
                 restore-keys: ${{ runner.name }}-x11-deps-
 
             - name: install crosscompiler