diff --git a/libexec/ftpd/blacklist.c b/libexec/ftpd/blacklist.c
index 85f90b5352d..7aca755f7d2 100644
--- a/libexec/ftpd/blacklist.c
+++ b/libexec/ftpd/blacklist.c
@@ -33,8 +33,8 @@
 #include <stdlib.h>
 #include <unistd.h>
 
-#include "blacklist_client.h"
 #include <blacklist.h>
+#include "blacklist_client.h"
 
 static struct blacklist *blstate;
 extern int use_blacklist;
@@ -48,7 +48,7 @@ blacklist_init(void)
 }
 
 void
-blacklist_notify(int action, int fd, char *msg)
+blacklist_notify(int action, int fd, const char *msg)
 {
 
 	if (blstate == NULL)
diff --git a/libexec/ftpd/blacklist_client.h b/libexec/ftpd/blacklist_client.h
index 7ac6fd11ed2..391b49c9bdf 100644
--- a/libexec/ftpd/blacklist_client.h
+++ b/libexec/ftpd/blacklist_client.h
@@ -31,14 +31,16 @@
 #ifndef BLACKLIST_CLIENT_H
 #define BLACKLIST_CLIENT_H
 
+#ifndef BLACKLIST_API_ENUM
 enum {
 	BLACKLIST_AUTH_OK = 0,
 	BLACKLIST_AUTH_FAIL
 };
+#endif
 
 #ifdef USE_BLACKLIST
 void blacklist_init(void);
-void blacklist_notify(int, int, char *);
+void blacklist_notify(int, int, const char *);
 
 #define BLACKLIST_INIT() blacklist_init()
 #define BLACKLIST_NOTIFY(x, y, z) blacklist_notify(x, y, z)