diff --git a/utils/TableGen/CodeGenDAGPatterns.cpp b/utils/TableGen/CodeGenDAGPatterns.cpp
index 303aa6c..61de0d2 100644
--- a/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -473,6 +473,7 @@
 }
 
 //! Dump the dependent variable set:
+#ifndef NDEBUG
 void DumpDepVars(MultipleUseVarSet &DepVars) {
   if (DepVars.empty()) {
     DEBUG(errs() << "<empty set>");
@@ -485,6 +486,8 @@
     DEBUG(errs() << "]");
   }
 }
+#endif
+
 }
 
 //===----------------------------------------------------------------------===//