diff --git a/build-system/scripts/check_rebuild b/build-system/scripts/check_rebuild
index 6e4e4b3384c5..76f99c6540e2 100755
--- a/build-system/scripts/check_rebuild
+++ b/build-system/scripts/check_rebuild
@@ -13,14 +13,13 @@ REPOSITORY=$2
 [[ "$COMMIT_MESSAGE" == *"[ci rebuild $REPOSITORY]"* ]] && exit 1
 [[ "$COMMIT_MESSAGE" == *"[ci rebuild]"* ]] && exit 1
 
-COMMIT_TAG_VERSION=$(extract_tag_version $REPOSITORY)
 DOCKERFILE=$(query_manifest dockerfile $REPOSITORY)
 
 # If we are deploying, and our Dockerfile uses the COMMIT_TAG arg, we need to rebuild to ensure the latest version
 # number is baked into the image.
 # TODO: This should probably be properly handled by e.g. release-please bumping the version number as part of its PR
 # which would invalidate the content hash, rather than us using Dockerfile ARGS.
-if [ -n "$COMMIT_TAG_VERSION" ] && grep -qE "^ARG COMMIT_TAG=" $DOCKERFILE; then
+if [ -n "$COMMIT_TAG" ] && grep -qE "^ARG COMMIT_TAG=" $DOCKERFILE; then
   exit 1
 fi