diff --git a/lib/Target/AArch64/AArch64CondBrTuning.cpp b/lib/Target/AArch64/AArch64CondBrTuning.cpp
index 13bcbe4304b..0a948812ff3 100644
--- a/lib/Target/AArch64/AArch64CondBrTuning.cpp
+++ b/lib/Target/AArch64/AArch64CondBrTuning.cpp
@@ -271,6 +271,7 @@ bool AArch64CondBrTuning::tryToTuneBranch(MachineInstr &MI,
     }
     break;
   }
+  (void)NewCmp; (void)NewBr;
   assert(NewCmp && NewBr && "Expected new instructions.");
 
   DEBUG(dbgs() << "  with instruction:\n    ");