diff --git a/lib/gssapi/ntlm/ntlm.h b/lib/gssapi/ntlm/ntlm.h
index 62f6f0a2e..82eb76e0b 100644
--- a/lib/gssapi/ntlm/ntlm.h
+++ b/lib/gssapi/ntlm/ntlm.h
@@ -45,6 +45,7 @@
 #include <errno.h>
 
 #include <gssapi.h>
+#include <gssapi_ntlm.h>
 #include <gssapi_mech.h>
 
 #include <krb5.h>