diff --git a/action.yaml b/action.yaml
index d5a8f16..3b08a48 100644
--- a/action.yaml
+++ b/action.yaml
@@ -138,7 +138,7 @@ runs:
       if: inputs.add_version_tag == 'true'
       run: |
         source "${{ github.action_path }}/../bashlib.sh"
-        if [[ -n '${{ inputs.version_tag_prefix }}']]
+        if [[ -n '${{ inputs.version_tag_prefix }}' ]] ; then
           prefix="${{ inputs.version_tag_prefix }}-"
         else
           prefix=""