diff --git a/Dockerfile b/Dockerfile
index a0c9537..e4a13f7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,7 +20,7 @@ LABEL "maintainer"="dockerimages@cabillot.eu" \
       "org.label-schema.vendor"="Julien Cabillot" \
       "org.label-schema.schema-version"="1.0" \
       "org.label-schema.applications.ansiblelint.version"="latest" \
-      "org.label-schema.vcs-ref"=$VCS_REF \
-      "org.label-schema.version"=$VERSION \
-      "org.label-schema.build-date"=$BUILD_DATE \
+      "org.label-schema.vcs-ref"="$VCS_REF" \
+      "org.label-schema.version"="$VERSION" \
+      "org.label-schema.build-date"="$BUILD_DATE" \
       "org.label-schema.usage"="docker run --rm -v $(pwd):/data registry.cabillot.eu/jcabillot/ansible-lint -p ."
\ No newline at end of file