diff --git a/include/asm-m68knommu/hardirq.h b/include/asm-m68knommu/hardirq.h
index 980075bab792..bfad28149a49 100644
--- a/include/asm-m68knommu/hardirq.h
+++ b/include/asm-m68knommu/hardirq.h
@@ -22,4 +22,6 @@ typedef struct {
 # error HARDIRQ_BITS is too low!
 #endif
 
+void ack_bad_irq(unsigned int irq);
+
 #endif /* __M68K_HARDIRQ_H */