diff --git a/lib/krb5/store_mem.c b/lib/krb5/store_mem.c
index c85773377..69985d620 100644
--- a/lib/krb5/store_mem.c
+++ b/lib/krb5/store_mem.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska Högskolan
+ * Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan
  * (Royal Institute of Technology, Stockholm, Sweden). 
  * All rights reserved. 
  *
@@ -53,7 +53,7 @@ mem_fetch(krb5_storage *sp, void *data, size_t size)
 }
 
 static ssize_t
-mem_store(krb5_storage *sp, void *data, size_t size)
+mem_store(krb5_storage *sp, const void *data, size_t size)
 {
     mem_storage *s = (mem_storage*)sp->data;
     if(size > s->base + s->size - s->ptr)