diff --git a/script/static-checks/static-checks-banned-apis.sh b/script/static-checks/static-checks-banned-apis.sh
index 4bab6a7..424bbcb 100755
--- a/script/static-checks/static-checks-banned-apis.sh
+++ b/script/static-checks/static-checks-banned-apis.sh
@@ -17,7 +17,7 @@
   echo "# Check for banned APIs in the patch"
   TEST_CASE="Banned API check on patch(es)"
   "$CI_ROOT/script/static-checks/check-banned-api.py" --tree "$1" \
-      --patch --from-ref $(get_merge_base) \
+      --patch --from-ref ${merge_base} \
       &> "$LOG_FILE"
 else
   echo "# Check for banned APIs in entire source tree"