diff --git a/test/MC/ARM/invalid-v8fp.s b/test/MC/ARM/invalid-v8fp.s
index e2dbb8b8d1e..4dff188b8e5 100644
--- a/test/MC/ARM/invalid-v8fp.s
+++ b/test/MC/ARM/invalid-v8fp.s
@@ -1,4 +1,4 @@
-@ RUN: llvm-mc -triple armv7 -show-encoding < %s | FileCheck %s
+@ RUN: not llvm-mc -triple armv7 -show-encoding < %s | FileCheck %s
 
 @ VCVT{B,T}