diff --git a/kernel/resource.c b/kernel/resource.c
index e697f20..7fd123a 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -304,7 +304,7 @@
 			 resource_size_t size, resource_size_t min,
 			 resource_size_t max, resource_size_t align,
 			 resource_size_t (*alignf)(void *,
-						   struct resource *,
+						   const struct resource *,
 						   resource_size_t,
 						   resource_size_t),
 			 void *alignf_data)
@@ -361,7 +361,7 @@
 		      resource_size_t size, resource_size_t min,
 		      resource_size_t max, resource_size_t align,
 		      resource_size_t (*alignf)(void *,
-						struct resource *,
+						const struct resource *,
 						resource_size_t,
 						resource_size_t),
 		      void *alignf_data)