diff --git a/test/CodeGen/X86/Atomics-64.ll b/test/CodeGen/X86/Atomics-64.ll
index 8e93762cec1..8b0a349a8be 100644
--- a/test/CodeGen/X86/Atomics-64.ll
+++ b/test/CodeGen/X86/Atomics-64.ll
@@ -1,5 +1,5 @@
-; RUN: llc < %s -march=x86-64 > %t
-; RUN: llc < %s -march=x86 > %t
+; RUN: llc < %s -march=x86-64 > %t.x86-64
+; RUN: llc < %s -march=x86 > %t.x86
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
 target triple = "x86_64-apple-darwin8"