diff --git a/lib/krb5/mk_req_ext.c b/lib/krb5/mk_req_ext.c
index a4f536768..fccb5a915 100644
--- a/lib/krb5/mk_req_ext.c
+++ b/lib/krb5/mk_req_ext.c
@@ -36,14 +36,14 @@
 RCSID("$Id$");
 
 krb5_error_code
-krb5_mk_req_internal(krb5_context context,
-		     krb5_auth_context *auth_context,
-		     const krb5_flags ap_req_options,
-		     krb5_data *in_data,
-		     krb5_creds *in_creds,
-		     krb5_data *outbuf,
-		     krb5_key_usage checksum_usage,
-		     krb5_key_usage encrypt_usage)
+_krb5_mk_req_internal(krb5_context context,
+		      krb5_auth_context *auth_context,
+		      const krb5_flags ap_req_options,
+		      krb5_data *in_data,
+		      krb5_creds *in_creds,
+		      krb5_data *outbuf,
+		      krb5_key_usage checksum_usage,
+		      krb5_key_usage encrypt_usage)
 {
   krb5_error_code ret;
   krb5_data authenticator;
@@ -168,7 +168,7 @@ krb5_mk_req_extended(krb5_context context,
 		     krb5_creds *in_creds,
 		     krb5_data *outbuf)
 {
-    return krb5_mk_req_internal (context,
+    return _krb5_mk_req_internal (context,
 				 auth_context,
 				 ap_req_options,
 				 in_data,