diff --git a/lib/kafs/afssys.c b/lib/kafs/afssys.c
index f4dfdbbb6..25bdefcd3 100644
--- a/lib/kafs/afssys.c
+++ b/lib/kafs/afssys.c
@@ -471,6 +471,18 @@ k_pioctl(char *a_path,
   return -1;
 }
 
+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;
+    return k_pioctl((char*)path, VIOC_FILE_CELL_NAME, &parms, 1);
+}
+
 int
 k_unlog(void)
 {
diff --git a/lib/kafs/kafs.h b/lib/kafs/kafs.h
index a0c661fbe..c09eb4e9d 100644
--- a/lib/kafs/kafs.h
+++ b/lib/kafs/kafs.h
@@ -16,10 +16,9 @@
 #define _VICEIOCTL(id)  ((unsigned int ) _IOW('V', id, struct ViceIoctl))
 #endif /* _VICEIOCTL */
 
-#define VIOCSETTOK _VICEIOCTL(3)
-#define VIOCUNLOG  _VICEIOCTL(9)
-
-#define VIOC_FILE_CELL_NAME _VICEIOCTL(30)
+#define VIOCSETTOK		_VICEIOCTL(3)
+#define VIOCUNLOG		_VICEIOCTL(9)
+#define VIOC_FILE_CELL_NAME	_VICEIOCTL(30)
 
 struct ViceIoctl {
   caddr_t in, out;
@@ -47,6 +46,7 @@ int k_pioctl __P((char *a_path,
 		  int a_followSymlinks));
 int k_unlog __P((void));
 int k_setpag __P((void));
+int k_afs_cell_of_file __P((const char *path, char *cell, int len));
 
 #define _PATH_VICE		"/usr/vice/etc/"
 #define _PATH_THISCELL 		_PATH_VICE "ThisCell"