diff --git a/tools/bugpoint/Miscompilation.cpp b/tools/bugpoint/Miscompilation.cpp
index 536c3db..47d90e5 100644
--- a/tools/bugpoint/Miscompilation.cpp
+++ b/tools/bugpoint/Miscompilation.cpp
@@ -657,7 +657,7 @@
       for (Function::arg_iterator
              I = newMain->arg_begin(), E = newMain->arg_end(),
              OI = oldMain->arg_begin(); I != E; ++I, ++OI) {
-        I->setName(OI->getName());    // Copy argument names from oldMain
+        I->takeName(OI);    // Copy argument names from oldMain
         args.push_back(I);
       }