diff --git a/lib/kafs/kafs.h b/lib/kafs/kafs.h
index b54d9f399..c699b5cd7 100644
--- a/lib/kafs/kafs.h
+++ b/lib/kafs/kafs.h
@@ -15,6 +15,8 @@
 #define VIOCSETTOK _VICEIOCTL(3)
 #define VIOCUNLOG  _VICEIOCTL(9)
 
+#define VIOC_FILE_CELL_NAME _VICEIOCTL(30)
+
 struct ViceIoctl {
   caddr_t in, out;
   short in_size;