diff --git a/scripts/test/wasm2js.py b/scripts/test/wasm2js.py
index 6463fa3a852..cbae2216a9c 100644
--- a/scripts/test/wasm2js.py
+++ b/scripts/test/wasm2js.py
@@ -41,9 +41,9 @@ def check_for_stale_files():
 
     all_files = os.listdir(shared.get_test_dir('wasm2js'))
     for f in all_files:
-        if f in assert_tests:
-            continue
         prefix = f.split('.')[0]
+        if prefix in [t.split('.')[0] for t in assert_tests]:
+            continue
         if prefix not in all_tests:
             shared.fail_with_error('orphan test output: %s' % f)