diff --git a/test/preparser/testcfg.py b/test/preparser/testcfg.py
index e709e2e540..8576a4c5ba 100644
--- a/test/preparser/testcfg.py
+++ b/test/preparser/testcfg.py
@@ -68,7 +68,7 @@ class TestSuite(testsuite.TestSuite):
       return MkTest
     with open(pathname) as f:
       text = f.read()
-    exec text in {"Test": Test, "Template": Template}
+    exec(text, {"Test": Test, "Template": Template})
 
   def ListTests(self):
     result = []