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diff --git a/kerberos.c b/kerberos.c
index 0eb51477..141c9e3a 100644
--- a/kerberos.c
+++ b/kerberos.c
@@ -32,7 +32,7 @@ typedef	long	int32;
 #error Cannot deduce a 32-bit-type
 #endif
 
-int do_rfc1731(int sock, char *command, char *truename)
+int do_rfc1731(int sock, const char *command, const char *truename)
 /* authenticate as per RFC1731 -- note 32-bit integer requirement here */
 {
     int result = 0, len;
@@ -241,15 +241,15 @@ int do_rfc1731(int sock, char *command, char *truename)
     while (authenticator.length & 7) {
 	authenticator.length++;
     }
-    des_pcbc_encrypt((des_cblock *)authenticator.dat,
-	    (des_cblock *)authenticator.dat, authenticator.length, schedule,
+    des_pcbc_encrypt((const unsigned char *)authenticator.dat,
+	    (unsigned char *)authenticator.dat, authenticator.length, schedule,
 	    &session, 1);
 
     to64frombits(buf1, authenticator.dat, authenticator.length);
 
     /* ship down the response, accept the server's error/ok indication */
     suppress_tags = TRUE;
-    result = gen_transact(sock, buf1, strlen(buf1));
+    result = gen_transact(sock, "%s", buf1);
     suppress_tags = FALSE;
     if (result)
 	return(result);