diff --git a/src/rxkad/rxkad_prototypes.h b/src/rxkad/rxkad_prototypes.h
index b7ce30758f..a610d612b1 100644
--- a/src/rxkad/rxkad_prototypes.h
+++ b/src/rxkad/rxkad_prototypes.h
@@ -31,7 +31,7 @@ extern int fc_keysched(struct ktc_encryptionKey *key,
 extern afs_int32 fc_ecb_encrypt(void * clear, void * cipher,
 				fc_KeySchedule schedule, int encrypt);
 extern afs_int32 fc_cbc_encrypt(void *input, void *output, afs_int32 length,
-				fc_KeySchedule key, afs_uint32 * xor,
+				fc_KeySchedule key, afs_uint32 * iv,
 				int encrypt);
 
 /* rxkad_client.c */