diff --git a/lib/krb4.c b/lib/krb4.c
index eb3d4f00f0..20f299b203 100644
--- a/lib/krb4.c
+++ b/lib/krb4.c
@@ -59,6 +59,7 @@
 
 #include "ftp.h"
 #include "sendf.h"
+#include "krb4.h"
 
 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
 #include "inet_ntoa_r.h"