diff --git a/.github/workflows/github_actions.yml b/.github/workflows/github_actions.yml
index 9450a14d6b..23b7a85100 100644
--- a/.github/workflows/github_actions.yml
+++ b/.github/workflows/github_actions.yml
@@ -472,6 +472,9 @@ jobs:
           ./travis/cpuinfo.sh
           echo "simd=$(./travis/guess_simd.sh)" >> $GITHUB_ENV
           echo "microarch=$(cat /tmp/microarch_$(id -u).txt)" >> $GITHUB_ENV
+          if [[ ! -z $USE_OPENMP ]]; then
+          echo "openmp=-openmp$USE_OPENMP" >> $GITHUB_ENV
+          fi
         shell: bash
       - name: Setup cache
         id: setup-cache
@@ -479,7 +482,7 @@ jobs:
         with:
           path: |
             ~/cache
-          key: ${{ matrix.os }}-${{ matrix.mpi_impl}}-${{ matrix.fc}}-xcode${{ matrix.xcode_version}}-simint${{ matrix.use_simint}}-blas${{ matrix.blas}}-blas_size${{ matrix.blas_size}}-libxc${{matrix.use_libxc}}-tblite${{matrix.use_tblite}}-simd${{ env.simd }}${{ env.microarch}}-nwchemcache-v003
+          key: ${{ matrix.os }}-${{ matrix.mpi_impl}}-${{ matrix.fc}}-xcode${{ matrix.xcode_version}}-simint${{ matrix.use_simint}}-blas${{ matrix.blas}}-blas_size${{ matrix.blas_size}}-libxc${{matrix.use_libxc}}-tblite${{matrix.use_tblite}}-simd${{ env.openmp }}${{ env.simd }}${{ env.microarch}}-nwchemcache-v003
       - name: build environment
         run: |
           pwd