diff --git a/arch/sh/include/asm/irq.h b/arch/sh/include/asm/irq.h
index 0f384b1f45ca..53fc18a3d4c2 100644
--- a/arch/sh/include/asm/irq.h
+++ b/arch/sh/include/asm/irq.h
@@ -13,12 +13,6 @@
  */
 #define NO_IRQ_IGNORE		((unsigned int)-1)
 
-/*
- * Simple Mask Register Support
- */
-extern void make_maskreg_irq(unsigned int irq);
-extern unsigned short *irq_mask_register;
-
 /*
  * PINT IRQs
  */