diff --git a/compiler/optimizing/instruction_simplifier.h b/compiler/optimizing/instruction_simplifier.h
index 5e20455..f409e87 100644
--- a/compiler/optimizing/instruction_simplifier.h
+++ b/compiler/optimizing/instruction_simplifier.h
@@ -49,7 +49,7 @@
 
   static constexpr const char* kInstructionSimplifierPassName = "instruction_simplifier";
 
-  void Run() OVERRIDE;
+  bool Run() OVERRIDE;
 
  private:
   CodeGenerator* codegen_;