diff --git a/lib/Target/R600/AMDGPUInstructions.td b/lib/Target/R600/AMDGPUInstructions.td
index 4b8685877d4..0f2b625dc69 100644
--- a/lib/Target/R600/AMDGPUInstructions.td
+++ b/lib/Target/R600/AMDGPUInstructions.td
@@ -133,7 +133,7 @@ def COND_NE : PatLeaf <
 
 def COND_NULL : PatLeaf <
   (cond),
-  [{return false;}]
+  [{(void)N; return false;}]
 >;
 
 //===----------------------------------------------------------------------===//