diff --git a/test/CodeGen/X86/rdtsc.ll b/test/CodeGen/X86/rdtsc.ll
index efc8ba6acc3..147838350f0 100644
--- a/test/CodeGen/X86/rdtsc.ll
+++ b/test/CodeGen/X86/rdtsc.ll
@@ -1,4 +1,5 @@
-; RUN: llvm-as < %s | llc -march=x86 | grep rdtsc
+; RUN: llvm-as < %s | llc -march=x86 | grep rdtsc &&
+; RUN: llvm-as < %s | llc -march=x86-64 | grep rdtsc
 
 declare ulong %llvm.readcyclecounter()