diff --git a/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h b/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h
index 898f1d3..e72d778 100644
--- a/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -124,6 +124,7 @@
   void visitSwitchInst(SwitchInst &I);
   void visitIndirectBrInst(IndirectBrInst &I);
 
+  void visitUnaryOperator(UnaryOperator &I);
   void visitBinaryOperator(BinaryOperator &I);
   void visitICmpInst(ICmpInst &I);
   void visitFCmpInst(FCmpInst &I);