diff --git a/test/Sema/builtins.c b/test/Sema/builtins.c
index 78b7562..068f300 100644
--- a/test/Sema/builtins.c
+++ b/test/Sema/builtins.c
@@ -34,7 +34,7 @@
 
 // atomics.
 
-unsigned char test9(short v) {
+void test9(short v) {
   unsigned i, old;
   
   old = __sync_fetch_and_add();  // expected-error {{too few arguments to function call}}