diff --git a/src/config.c b/src/config.c
index 3d87a178..27e6ca4b 100644
--- a/src/config.c
+++ b/src/config.c
@@ -210,6 +210,7 @@ static struct ssh_config_match_keyword_table_s ssh_config_match_keyword_table[]
     { "originalhost", MATCH_ORIGINALHOST },
     { "user", MATCH_USER },
     { "localuser", MATCH_LOCALUSER },
+    { NULL, MATCH_UNKNOWN },
 };
 
 static int ssh_config_parse_line(ssh_session session, const char *line,