diff --git a/lib/Analysis/Lint.cpp b/lib/Analysis/Lint.cpp
index 2c8fc0bba41..ec17f47acb8 100644
--- a/lib/Analysis/Lint.cpp
+++ b/lib/Analysis/Lint.cpp
@@ -207,7 +207,7 @@ void Lint::visitCallSite(CallSite CS) {
             &I);
 
     FunctionType *FT = F->getFunctionType();
-    unsigned NumActualArgs = unsigned(CS.arg_end()-CS.arg_begin());
+    unsigned NumActualArgs = CS.arg_size();
 
     Assert1(FT->isVarArg() ?
               FT->getNumParams() <= NumActualArgs :