Cosmetics.

diff --git a/files/dos_fs.c b/files/dos_fs.c
index 8af8ff1..c303472 100644
--- a/files/dos_fs.c
+++ b/files/dos_fs.c
@@ -734,7 +734,7 @@
     SERVER_END_VAR_REQ;
 
     if(!ret)
-        ERR("Couldn't open %s ! (check permissions)\n",devname);
+        ERR("Couldn't open device '%s' ! (check permissions)\n",devname);
     else
         TRACE("return %08X\n", ret );
     return ret;