diff --git a/dlls/ntdll/tests/om.c b/dlls/ntdll/tests/om.c
index 916ac8cbe76..788fa0bca15 100644
--- a/dlls/ntdll/tests/om.c
+++ b/dlls/ntdll/tests/om.c
@@ -1433,7 +1433,7 @@ static void test_query_object(void)
     handle = CreateFileA( "\\\\.\\mailslot", 0, 0, NULL, OPEN_EXISTING, 0, 0 );
     ok( handle != INVALID_HANDLE_VALUE, "CreateFile failed (%d)\n", GetLastError() );
 
-    test_object_name( handle, L"\\Device\\Mailslot", TRUE );
+    test_object_name( handle, L"\\Device\\Mailslot", FALSE );
     test_object_type( handle, L"File" );
     test_file_info( handle );
 
diff --git a/server/mailslot.c b/server/mailslot.c
index fa1a0c2c15a..9c58ed77a51 100644
--- a/server/mailslot.c
+++ b/server/mailslot.c
@@ -217,6 +217,7 @@ static const struct object_ops mailslot_device_ops =
 
 static void mailslot_device_file_dump( struct object *obj, int verbose );
 static struct fd *mailslot_device_file_get_fd( struct object *obj );
+static WCHAR *mailslot_device_file_get_full_name( struct object *obj, data_size_t *len );
 static void mailslot_device_file_destroy( struct object *obj );
 static enum server_fd_type mailslot_device_file_get_fd_type( struct fd *fd );
 
@@ -234,7 +235,7 @@ static const struct object_ops mailslot_device_file_ops =
     default_fd_map_access,                  /* map_access */
     default_get_sd,                         /* get_sd */
     default_set_sd,                         /* set_sd */
-    no_get_full_name,                       /* get_full_name */
+    mailslot_device_file_get_full_name,     /* get_full_name */
     no_lookup_name,                         /* lookup_name */
     no_link_name,                           /* link_name */
     NULL,                                   /* unlink_name */
@@ -462,6 +463,12 @@ static struct fd *mailslot_device_file_get_fd( struct object *obj )
     return (struct fd *)grab_object( file->fd );
 }
 
+static WCHAR *mailslot_device_file_get_full_name( struct object *obj, data_size_t *len )
+{
+    struct mailslot_device_file *file = (struct mailslot_device_file *)obj;
+    return file->device->obj.ops->get_full_name( &file->device->obj, len );
+}
+
 static void mailslot_device_file_destroy( struct object *obj )
 {
     struct mailslot_device_file *file = (struct mailslot_device_file*)obj;