diff --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp b/llvm/lib/CodeGen/LiveDebugVariables.cpp
index a6812af..a6dc566 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.cpp
+++ b/llvm/lib/CodeGen/LiveDebugVariables.cpp
@@ -365,6 +365,7 @@
   }
 }
 
+#ifndef NDEBUG
 void UserValue::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
   auto *DV = cast<DILocalVariable>(Variable);
   OS << "!\"";
@@ -390,6 +391,7 @@
   for (unsigned i = 0, e = userValues.size(); i != e; ++i)
     userValues[i]->print(OS, TRI);
 }
+#endif
 
 void UserValue::coalesceLocation(unsigned LocNo) {
   unsigned KeepLoc = 0;