diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index 6a154cc..35e6922 100644
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -343,9 +343,7 @@
   // Check main() type
   unsigned NumArgs = Fn->getFunctionType()->getNumParams();
   const FunctionType *FTy = Fn->getFunctionType();
-  const Type* PPInt8Ty = 
-    PointerType::getUnqual(PointerType::getUnqual(
-          Type::getInt8Ty(Fn->getContext())));
+  const Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
   switch (NumArgs) {
   case 3:
    if (FTy->getParamType(2) != PPInt8Ty) {
@@ -364,7 +362,7 @@
    // FALLS THROUGH
   case 0:
    if (!isa<IntegerType>(FTy->getReturnType()) &&
-       FTy->getReturnType() != Type::getVoidTy(FTy->getContext())) {
+       !FTy->getReturnType()->isVoidTy()) {
      llvm_report_error("Invalid return type of main() supplied");
    }
    break;
diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
index a26fc36..73f5558 100644
--- a/lib/ExecutionEngine/Interpreter/Execution.cpp
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -602,7 +602,7 @@
     ExecutionContext &CallingSF = ECStack.back();
     if (Instruction *I = CallingSF.Caller.getInstruction()) {
       // Save result...
-      if (CallingSF.Caller.getType() != Type::getVoidTy(RetTy->getContext()))
+      if (!CallingSF.Caller.getType()->isVoidTy())
         SetValue(I, Result, CallingSF);
       if (InvokeInst *II = dyn_cast<InvokeInst> (I))
         SwitchToNewBasicBlock (II->getNormalDest (), CallingSF);
diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp
index ebc2567..3eafe5f 100644
--- a/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/lib/ExecutionEngine/JIT/JIT.cpp
@@ -411,8 +411,7 @@
 
   // Handle some common cases first.  These cases correspond to common `main'
   // prototypes.
-  if (RetTy == Type::getInt32Ty(F->getContext()) ||
-      RetTy == Type::getVoidTy(F->getContext())) {
+  if (RetTy == Type::getInt32Ty(F->getContext()) || RetTy->isVoidTy()) {
     switch (ArgValues.size()) {
     case 3:
       if (FTy->getParamType(0) == Type::getInt32Ty(F->getContext()) &&
@@ -548,7 +547,7 @@
                                        "", StubBB);
   TheCall->setCallingConv(F->getCallingConv());
   TheCall->setTailCall();
-  if (TheCall->getType() != Type::getVoidTy(F->getContext()))
+  if (!TheCall->getType()->isVoidTy())
     // Return result of the call.
     ReturnInst::Create(F->getContext(), TheCall, StubBB);
   else