diff --git a/sys/arm/include/cpufunc.h b/sys/arm/include/cpufunc.h
index 6251e2c85a6..c2a96a81507 100644
--- a/sys/arm/include/cpufunc.h
+++ b/sys/arm/include/cpufunc.h
@@ -411,7 +411,7 @@ void	armv6_idcache_wbinv_range	(vm_offset_t, vm_size_t);
 void	armv7_setttb			(u_int);
 void	armv7_tlb_flushID		(void);
 void	armv7_tlb_flushID_SE		(u_int);
-void	armv7_icache_sync_all		();
+void	armv7_icache_sync_all		(void);
 void	armv7_icache_sync_range		(vm_offset_t, vm_size_t);
 void	armv7_idcache_wbinv_range	(vm_offset_t, vm_size_t);
 void	armv7_idcache_inv_all		(void);