diff --git a/include/llvm/CodeGen/SelectionDAGISel.h b/include/llvm/CodeGen/SelectionDAGISel.h
index 1b9c2686050..f9716142b92 100644
--- a/include/llvm/CodeGen/SelectionDAGISel.h
+++ b/include/llvm/CodeGen/SelectionDAGISel.h
@@ -137,6 +137,12 @@ protected:
     return false;
   }
   
+  virtual SDValue RunSDNodeXForm(SDValue V, unsigned XFormNo) {
+    assert(0 && "Tblgen shoudl generate this!");
+    return SDValue();
+  }
+
+  
   // Calls to these functions are generated by tblgen.
   SDNode *Select_INLINEASM(SDNode *N);
   SDNode *Select_UNDEF(SDNode *N);