1 files changed, 3 insertions, 2 deletions
diff --git a/check.py b/check.py
index f0bb04f19..d1c676b41 100755
--- a/check.py
+++ b/check.py
@@ -96,8 +96,9 @@ def run_wasm_opt_tests():
         binary = '.wasm' in t
         base = os.path.basename(t).replace('.wast', '').replace('.wasm', '')
         passname = base
-        if passname.isdigit():
-            passname = open(os.path.join(shared.get_test_dir('passes'), passname + '.passes')).read().strip()
+        passes_file = os.path.join(shared.get_test_dir('passes'), passname + '.passes')
+        if os.path.exists(passes_file):
+            passname = open(passes_file).read().strip()
         opts = [('--' + p if not p.startswith('O') else '-' + p) for p in passname.split('_')]
         actual = ''
         for module, asserts in support.split_wast(t):