diff --git a/gcc/config/sh/sh-protos.h b/gcc/config/sh/sh-protos.h
index c87000bceeb..4135b334af1 100644
--- a/gcc/config/sh/sh-protos.h
+++ b/gcc/config/sh/sh-protos.h
@@ -129,6 +129,8 @@ extern void sh_initialize_trampoline PARAMS ((rtx, rtx, rtx));
 extern enum reg_class sh_cannot_change_mode_class
 	      PARAMS ((enum machine_mode, enum machine_mode));
 extern void sh_mark_label PARAMS ((rtx, int));
+extern int sh_register_move_cost
+  PARAMS ((enum machine_mode mode, enum reg_class, enum reg_class));
 
 #ifdef HARD_CONST
 extern void fpscr_set_from_mem PARAMS ((int, HARD_REG_SET));