diff --git a/src/llvm/lib/Target/W65816/W65816ISelLowering.cpp b/src/llvm/lib/Target/W65816/W65816ISelLowering.cpp
index d7777ba..35db62f 100644
--- a/src/llvm/lib/Target/W65816/W65816ISelLowering.cpp
+++ b/src/llvm/lib/Target/W65816/W65816ISelLowering.cpp
@@ -1575,7 +1575,9 @@ SDValue W65816TargetLowering::LowerOperation(SDValue Op,
     return buildWide32(DAG, DL, Lo, Hi);
   }
   default:
+#ifndef NDEBUG
     Op.dump();
+#endif
     llvm_unreachable("W65816: unexpected operation in LowerOperation");
   }
 }