diff --git a/.github/workflows/macos-upstream-zlib-ng.yml b/.github/workflows/macos-upstream-zlib-ng.yml
index fe79d2b..6e461cd 100644
--- a/.github/workflows/macos-upstream-zlib-ng.yml
+++ b/.github/workflows/macos-upstream-zlib-ng.yml
@@ -84,7 +84,7 @@ jobs:
       with:
         # NOTE: path doesn't expand variables!
         path: upstream-zlib-install
-        key: ${{ runner.os }}-zlib-ng-${{ matrix.zlib-version }}-${{ matrix.zlib-native }}
+        key: ${{ runner.os }}-${{ runner.arch }}-zlib-ng-${{ matrix.zlib-version }}-${{ matrix.zlib-native }}
 
     - name: Wipe develop cached files, if found
       if: env.STEP_ENABLED && matrix.zlib-version == 'develop' && steps.cache-zlib.outputs.cache-hit
diff --git a/.github/workflows/macos-upstream-zlib.yml b/.github/workflows/macos-upstream-zlib.yml
index c16f731..d9c7438 100644
--- a/.github/workflows/macos-upstream-zlib.yml
+++ b/.github/workflows/macos-upstream-zlib.yml
@@ -82,7 +82,7 @@ jobs:
       with:
         # NOTE: path doesn't expand variables!
         path: upstream-zlib-install
-        key: ${{ runner.os }}-zlib-${{ matrix.zlib-version }}
+        key: ${{ runner.os }}-${{runner.arch}}-zlib-${{ matrix.zlib-version }}
 
     - name: Wipe develop cached files, if found
       if: env.STEP_ENABLED && matrix.zlib-version == 'develop' && steps.cache-zlib.outputs.cache-hit