diff --git a/llvm/lib/Target/CBackend/Writer.cpp b/llvm/lib/Target/CBackend/Writer.cpp
index ff87be775849..8156e88d6716 100644
--- a/llvm/lib/Target/CBackend/Writer.cpp
+++ b/llvm/lib/Target/CBackend/Writer.cpp
@@ -348,7 +348,7 @@ void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
     if (PrintedType)
       FunctionInnards << ", ";
     printType(FunctionInnards, *I, 
-        /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
+        /*isSigned=*/!FTy->paramHasAttr(Idx, FunctionType::ZExtAttribute), "");
     PrintedType = true;
   }
   if (FTy->isVarArg()) {
@@ -360,7 +360,7 @@ void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
   FunctionInnards << ')';
   std::string tstr = FunctionInnards.str();
   printType(Out, RetTy, 
-      /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
+      /*isSigned=*/!FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
 }
 
 std::ostream &
@@ -417,7 +417,7 @@ std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
       if (I != FTy->param_begin())
         FunctionInnards << ", ";
       printType(FunctionInnards, *I, 
-          /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
+         /*isSigned=*/!FTy->paramHasAttr(Idx, FunctionType::ZExtAttribute), "");
       ++Idx;
     }
     if (FTy->isVarArg()) {
@@ -429,7 +429,7 @@ std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
     FunctionInnards << ')';
     std::string tstr = FunctionInnards.str();
     printType(Out, FTy->getReturnType(), 
-        /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
+        /*isSigned=*/!FTy->paramHasAttr(0, FunctionType::ZExtAttribute), tstr);
     return Out;
   }
   case Type::StructTyID: {
@@ -1775,7 +1775,7 @@ void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
         else
           ArgName = "";
         printType(FunctionInnards, I->getType(), 
-            /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute), 
+            /*isSigned=*/!FT->paramHasAttr(Idx, FunctionType::ZExtAttribute), 
             ArgName);
         PrintedArg = true;
         ++Idx;
@@ -1796,7 +1796,7 @@ void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
     for (; I != E; ++I) {
       if (PrintedArg) FunctionInnards << ", ";
       printType(FunctionInnards, *I,
-               /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute));
+             /*isSigned=*/!FT->paramHasAttr(Idx, FunctionType::ZExtAttribute));
       PrintedArg = true;
       ++Idx;
     }
@@ -1823,7 +1823,8 @@ void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
   }
     
   // Print out the return type and the signature built above.
-  printType(Out, RetTy, FT->paramHasAttr(0, FunctionType::SExtAttribute),
+  printType(Out, RetTy, 
+            /*isSigned=*/!FT->paramHasAttr(0, FunctionType::ZExtAttribute), 
             FunctionInnards.str());
 }
 
@@ -2516,7 +2517,7 @@ void CWriter::visitCallInst(CallInst &I) {
         (*AI)->getType() != FTy->getParamType(ArgNo)) {
       Out << '(';
       printType(Out, FTy->getParamType(ArgNo), 
-              /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute));
+            /*isSigned=*/!FTy->paramHasAttr(Idx, FunctionType::ZExtAttribute));
       Out << ')';
     }
     writeOperand(*AI);