diff --git a/lib/gssapi/gss.c b/lib/gssapi/gss.c
index 3f1e48862..b044ed42d 100644
--- a/lib/gssapi/gss.c
+++ b/lib/gssapi/gss.c
@@ -39,6 +39,7 @@
 #include <gssapi.h>
 #include <gssapi_krb5.h>
 #include <gssapi_spnego.h>
+#include <gssapi_ntlm.h>
 #include <err.h>
 #include <roken.h>
 #include <getarg.h>