diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5a1f1e0..2342f77 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -36,11 +36,18 @@ jobs:
           if [ ${{ matrix.id }} = "debian" -a "${version}" = "latest" ]; then
             tags="${tags},groonga/groonga:latest"
           fi
+
+          need_push="no"
+          if [ "${GITHUB_EVENT_NAME}" = "push" ]; then
+            need_push="yes"
+          fi
           echo "DISTRIBUTION=${distribution}" >> ${GITHUB_ENV}
           echo "CONTEXT=./${distribution}" >> ${GITHUB_ENV}
           echo "TAGS=${tags}" >> ${GITHUB_ENV}
+          echo "NEED_PUSH=${need_push}" >> ${GITHUB_ENV}
       - uses: actions/checkout@v4
       - uses: docker/login-action@v3
+        if: env.NEED_PUSH == 'yes'
         with:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
           password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
@@ -52,7 +59,7 @@ jobs:
           # cache-from: type=gha
           # cache-to: type=gha,mode=max
           context: ${{ env.CONTEXT }}
-          push: true
+          push: ${{ env.NEED_PUSH == 'yes' }}
           tags: ${{ env.TAGS }}
       - name: Image info
         run: |