diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
index 981a38d..09f7779 100644
--- a/lib/CodeGen/TargetInfo.cpp
+++ b/lib/CodeGen/TargetInfo.cpp
@@ -2360,7 +2360,8 @@
        it != ie; ++it) {
     bool isNamedArg = true;
     if (isVariadic)
-      isNamedArg = (it - FI.arg_begin()) < numRequiredArgs;
+      isNamedArg = (it - FI.arg_begin()) < 
+                    static_cast<signed>(numRequiredArgs);
 
     unsigned neededInt, neededSSE;
     it->info = classifyArgumentType(it->type, freeIntRegs, neededInt,