--- a/master/domain.c	Mon Dec 29 15:24:37 2008 +0000
+++ b/master/domain.c	Mon Dec 29 15:27:39 2008 +0000
@@ -336,7 +336,7 @@
 
 /*****************************************************************************/
 
-size_t ecrt_domain_size(ec_domain_t *domain)
+size_t ecrt_domain_size(const ec_domain_t *domain)
 {
     return domain->data_size;
 }