diff --git a/include/llvm/Pass.h b/include/llvm/Pass.h
index 955d9a009cc..896839effc9 100644
--- a/include/llvm/Pass.h
+++ b/include/llvm/Pass.h
@@ -387,7 +387,7 @@ public:
 
   void pop();
   inline PMDataManager *top() { return S.back(); }
-  void push(Pass *P);
+  void push(PMDataManager *PM);
   inline bool empty() { return S.empty(); }
 
   void dump();
diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index bef1171bd0e..275e0aea3fe 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -1395,10 +1395,9 @@ void PMStack::pop() {
 }
 
 // Push PM on the stack and set its top level manager.
-void PMStack::push(Pass *P) {
+void PMStack::push(PMDataManager *PM) {
 
   PMDataManager *Top = NULL;
-  PMDataManager *PM = dynamic_cast<PMDataManager *>(P);
   assert (PM && "Unable to push. Pass Manager expected");
 
   if (this->empty()) {