diff --git a/libfreerdp/core/nla.c b/libfreerdp/core/nla.c
index b477f4f5b..2508bd2b0 100644
--- a/libfreerdp/core/nla.c
+++ b/libfreerdp/core/nla.c
@@ -1426,7 +1426,7 @@ static BOOL nla_write_KERB_TICKET_LOGON(wStream* s, const KERB_TICKET_LOGON* tic
 	return TRUE;
 }
 
-BOOL nla_get_KERB_TICKET_LOGON(rdpNla* nla, KERB_TICKET_LOGON* logonTicket)
+static BOOL nla_get_KERB_TICKET_LOGON(rdpNla* nla, KERB_TICKET_LOGON* logonTicket)
 {
 	WINPR_ASSERT(nla);
 	WINPR_ASSERT(logonTicket);