diff --git a/Modules/parsermodule.c b/Modules/parsermodule.c
index 7a99283a7f3..8baa693f9cc 100644
--- a/Modules/parsermodule.c
+++ b/Modules/parsermodule.c
@@ -2086,7 +2086,7 @@ static int
 validate_arglist(node *tree)
 {
     int nch = NCH(tree);
-    int i, ok;
+    int i, ok = 1;
     node *last;
 
     if (nch <= 0)