diff --git a/core/cfs/cfs-xmem.c b/core/cfs/cfs-xmem.c
index aac3e7f89..98581fa87 100644
--- a/core/cfs/cfs-xmem.c
+++ b/core/cfs/cfs-xmem.c
@@ -30,7 +30,7 @@
  *
  * Author: Adam Dunkels <adam@sics.se>
  *
- * $Id: cfs-xmem.c,v 1.2 2007/03/23 12:15:08 nifi Exp $
+ * $Id: cfs-xmem.c,v 1.3 2007/03/23 15:52:13 nifi Exp $
  */
 #include "contiki.h"
 
@@ -42,8 +42,8 @@ struct filestate {
   int flag;
 #define FLAG_FILE_CLOSED 0
 #define FLAG_FILE_OPEN   1
-  int fileptr;
-  int filesize;
+  unsigned int fileptr;
+  unsigned int filesize;
 };
 
 #ifdef CFS_XMEM_CONF_OFFSET
@@ -174,6 +174,8 @@ PROCESS_THREAD(cfs_xmem_process, ev, data)
 {
   PROCESS_BEGIN();
 
+  file.fileptr = file.filesize = 0;
+
   SERVICE_REGISTER(cfs_xmem_service);
 
   PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_SERVICE_REMOVED ||