diff --git a/lib/kafs/afssys.c b/lib/kafs/afssys.c
index 25bdefcd3..cb4475f05 100644
--- a/lib/kafs/afssys.c
+++ b/lib/kafs/afssys.c
@@ -475,11 +475,10 @@ int
 k_afs_cell_of_file(const char *path, char *cell, int len)
 {
     struct ViceIoctl parms;
-    memset(&parms, 0, sizeof(parms));
     parms.in = NULL;
     parms.in_size = 0;
     parms.out = cell;
-    parms.out_len = len;
+    parms.out_size = len;
     return k_pioctl((char*)path, VIOC_FILE_CELL_NAME, &parms, 1);
 }