diff --git a/Python/compile.c b/Python/compile.c
index 5e6a18e..5fa405d 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1878,7 +1878,7 @@
 	else
 		co = NULL;
 	com_free(&sc);
-	if (co != NULL)
+	if (co != NULL && filename[0] != '<')
 		optimizer(co);
 	return co;
 }