diff --git a/src/storage/page.c b/src/storage/page.c
index af22dc9..81faf38 100644
--- a/src/storage/page.c
+++ b/src/storage/page.c
@@ -46,7 +46,7 @@ struct Page
 /* ---- Hilfsfunktionen ---- */
 
 static PageHeader*
-header(Page* p)
+header(const Page* p)
 {
     return (PageHeader*) p->raw;
 }