diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp
index 8b33e228270..bddf0afe00f 100644
--- a/lib/Transforms/Scalar/SCCP.cpp
+++ b/lib/Transforms/Scalar/SCCP.cpp
@@ -193,6 +193,7 @@ private:
   void visitCallInst      (Instruction &I) { markOverdefined(&I); }
   void visitInvokeInst    (Instruction &I) { markOverdefined(&I); }
   void visitAllocationInst(Instruction &I) { markOverdefined(&I); }
+  void visitVarArgInst    (Instruction &I) { markOverdefined(&I); }
   void visitFreeInst      (Instruction &I) { /*returns void*/ }
 
   void visitInstruction(Instruction &I) {