diff --git a/.github/workflows/docker_build.yml b/.github/workflows/docker_build.yml
index d586b0c..b1c13dc 100644
--- a/.github/workflows/docker_build.yml
+++ b/.github/workflows/docker_build.yml
@@ -22,7 +22,7 @@ jobs:
           echo "${GITHUB_REF/refs\/tags\//}"
           echo "${GITHUB_REF#refs/*/}"
           echo "${GITHUB_REF}"
-          echo "GITHASH=${git show -s --format=%H}" >> ${GITHASH}
+          echo "GITHASH=$(git show -s --format=%H)" >> ${GITHASH}
       - uses: actions/checkout@v3
 
       - name: set lower case repository name
diff --git a/.github/workflows/docker_build_pre.yml b/.github/workflows/docker_build_pre.yml
index bdf752e..54d0dbf 100644
--- a/.github/workflows/docker_build_pre.yml
+++ b/.github/workflows/docker_build_pre.yml
@@ -22,7 +22,7 @@ jobs:
           echo "${GITHUB_REF/refs\/tags\//}"
           echo "${GITHUB_REF#refs/*/}"
           echo "${GITHUB_REF}"
-          echo "GITHASH=${git show -s --format=%H}" >> ${GITHASH}
+          echo "GITHASH=$(git show -s --format=%H)" >> ${GITHASH}
       - uses: actions/checkout@v3
 
       - name: set lower case repository name