diff --git a/arch/sh/include/asm/irq.h b/arch/sh/include/asm/irq.h
index 02c2f0102cfa..45d08b6a5ef7 100644
--- a/arch/sh/include/asm/irq.h
+++ b/arch/sh/include/asm/irq.h
@@ -9,7 +9,7 @@
  * advised to cap this at the hard limit that they're interested in
  * through the machvec.
  */
-#define NR_IRQS			256
+#define NR_IRQS			512
 #define NR_IRQS_LEGACY		8	/* Legacy external IRQ0-7 */
 
 /*