diff --git a/test/CodeGen/ARM/extload-knownzero.ll b/test/CodeGen/ARM/extload-knownzero.ll
index 348285399ad..e56dcf967fa 100644
--- a/test/CodeGen/ARM/extload-knownzero.ll
+++ b/test/CodeGen/ARM/extload-knownzero.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=arm | FileCheck %s
+; RUN: llc < %s -march=arm -O0 | FileCheck %s
 ; rdar://12771555
 
 define void @foo(i16* %ptr, i32 %a) nounwind {