diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index bb9cbd2..6938a76 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -1660,7 +1660,7 @@
     // "cmd" pointer is always second argument.
     Elts.push_back(getOrCreateType(OMethod->getCmdDecl()->getType(), F));
     // Get rest of the arguments.
-    for (ObjCMethodDecl::param_iterator PI = OMethod->param_begin(), 
+    for (ObjCMethodDecl::param_const_iterator PI = OMethod->param_begin(), 
            PE = OMethod->param_end(); PI != PE; ++PI)
       Elts.push_back(getOrCreateType((*PI)->getType(), F));