diff --git a/sys/x86/isa/atpic.c b/sys/x86/isa/atpic.c
index 56566ef8d64..0c884c5fc48 100644
--- a/sys/x86/isa/atpic.c
+++ b/sys/x86/isa/atpic.c
@@ -68,8 +68,6 @@
 
 #define	IMEN_MASK(ai)		(IRQ_MASK((ai)->at_irq))
 
-#define	NUM_ISA_IRQS		16
-
 static void	atpic_init(void *dummy);
 
 inthand_t
diff --git a/sys/x86/isa/icu.h b/sys/x86/isa/icu.h
index ae7303c0e36..35734750b3b 100644
--- a/sys/x86/isa/icu.h
+++ b/sys/x86/isa/icu.h
@@ -71,4 +71,6 @@
 void	atpic_handle_intr(u_int vector, struct trapframe *frame);
 void	atpic_startup(void);
 
+#define	NUM_ISA_IRQS		16
+
 #endif /* !_X86_ISA_ICU_H_ */