diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index 2d03a76..a5e6064 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -351,6 +351,8 @@
     Context.getLastInserted()->setDestNonKillable();
   }
 
+  bool shouldOptimizeMemIntrins();
+
   Cfg *Func;
   GlobalContext *Ctx;
   bool HasComputedFrame = false;