diff --git a/test/FrontendC/2011-03-08-ZeroFieldUnionInitializer.c b/test/FrontendC/2011-03-08-ZeroFieldUnionInitializer.c
index 30a715bd46f..1fd8a878246 100644
--- a/test/FrontendC/2011-03-08-ZeroFieldUnionInitializer.c
+++ b/test/FrontendC/2011-03-08-ZeroFieldUnionInitializer.c
@@ -1,3 +1,4 @@
+// RUN: %llvmgcc -S %s
 typedef struct {
   union {
     struct { } __attribute((packed));