diff --git a/script/static-checks/static-checks-include-order.sh b/script/static-checks/static-checks-include-order.sh
index 364929c..21fcb72 100755
--- a/script/static-checks/static-checks-include-order.sh
+++ b/script/static-checks/static-checks-include-order.sh
@@ -17,7 +17,7 @@
   TEST_CASE="Order of includes on the patch series"
   echo "# $TEST_CASE"
   "$CI_ROOT/script/static-checks/check-include-order.py" --tree "$1" \
-      --patch --from-ref $(get_merge_base) \
+      --patch --from-ref ${merge_base} \
       &> "$LOG_FILE"
 else
   echo "# Check order of includes of the entire source tree"