diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index aa5fee0..db8b9ab 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -166,6 +166,7 @@
   }
 
   virtual void SetupBlockedRegisters() const OVERRIDE;
+
   virtual Location AllocateFreeRegister(Primitive::Type type) const OVERRIDE;
 
   virtual Location GetStackLocation(HLoadLocal* load) const OVERRIDE;
@@ -173,6 +174,9 @@
   virtual void DumpCoreRegister(std::ostream& stream, int reg) const OVERRIDE;
   virtual void DumpFloatingPointRegister(std::ostream& stream, int reg) const OVERRIDE;
 
+  // Blocks all register pairs made out of blocked core registers.
+  void UpdateBlockedPairRegisters() const;
+
   ParallelMoveResolverX86* GetMoveResolver() {
     return &move_resolver_;
   }