diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1547b7a..d4c47b4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -245,7 +245,7 @@ jobs:
         run: |
           EOF=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
           cat << $EOF > ${{ env.SSH_KEY_KNOWN_HOSTS }}
-          ${{ env.CONTAINER_HOST_NAME}}:${{ env.CONTAINER_HOST_PORT }} ${{ steps.get_ssh_public_key.outputs.value }}
+          [${{ env.CONTAINER_HOST_NAME}}]:${{ env.CONTAINER_HOST_PORT }} ${{ steps.get_ssh_public_key.outputs.value }}
           $EOF
           chmod 644 ${{ env.SSH_KEY_KNOWN_HOSTS }}
           echo "Known hosts is :"