diff --git a/test/CodeGen/conditional-gnu-ext.c b/test/CodeGen/conditional-gnu-ext.c
index 5b2eb3f..d4ae330 100644
--- a/test/CodeGen/conditional-gnu-ext.c
+++ b/test/CodeGen/conditional-gnu-ext.c
@@ -1,4 +1,4 @@
-// RUN: clang -emit-llvm %s
+// RUN: clang -emit-llvm %s -o %t
 // PR1824
 
 int foo(int x, short y) {