diff --git a/script/test b/script/test
index 31e90226..9b578dcf 100755
--- a/script/test
+++ b/script/test
@@ -90,7 +90,7 @@ if [[ \
   -n $TREE_SITTER_TEST_EXAMPLE_FILTER || \
   -n $TREE_SITTER_TEST_TRIAL_FILTER \
 ]]; then
-  echo ${top_level_filter:=corpus}
+  : ${top_level_filter:=corpus}
 fi
 
 if [[ "${mode}" == "debug" ]]; then