diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index c3a43915c27..a622e819fa3 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -874,7 +874,7 @@ X86TargetLowering::LowerFastCCArguments(SDOperand Op, SelectionDAG &DAG) {
     if (ObjSize > 4)
       ArgIncrement = ObjSize;
 
-    unsigned Reg;
+    unsigned Reg = 0;
     SDOperand ArgValue;
     if (ObjIntRegs || ObjXMMRegs) {
       switch (ObjectVT) {