diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index 1ae9af3..1bd28da 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -474,6 +474,7 @@
 
   // Compare int values. Supports only register locations for `lhs`.
   void GenerateIntCompare(Location lhs, Location rhs);
+  void GenerateIntCompare(Register lhs, Location rhs);
 
   // Construct address for array access.
   static Address ArrayAddress(Register obj,