--- a/master/fsm_slave.c	Thu May 20 11:16:37 2010 +0200
+++ b/master/fsm_slave.c	Thu May 20 12:35:36 2010 +0200
@@ -311,7 +311,7 @@
     }
 
     // finished transferring FoE
-    EC_SLAVE_DBG(slave, 1, "Successfully transferred %u bytes of FoE"
+    EC_SLAVE_DBG(slave, 1, "Successfully transferred %zu bytes of FoE"
             " data.\n", request->data_size);
 
     request->state = EC_INT_REQUEST_SUCCESS;