diff --git a/test/CodeGen/X86/fabs.ll b/test/CodeGen/X86/fabs.ll
index 4eca7162145..216cf8f37a4 100644
--- a/test/CodeGen/X86/fabs.ll
+++ b/test/CodeGen/X86/fabs.ll
@@ -1,5 +1,5 @@
 ; Make sure this testcase codegens to the fabs instruction, not a call to fabsf
-; RUN: llvm-as < %s | llc -disable-pattern-isel=0 | grep 'fabs$'
+; RUN: llvm-as < %s | llc -march=x86 -disable-pattern-isel=0 | grep 'fabs$'
 
 declare float %fabsf(float)