diff --git a/degesch.c b/degesch.c
index 9bc7b8a..bb14054 100644
--- a/degesch.c
+++ b/degesch.c
@@ -2191,7 +2191,7 @@ irc_handle_quit (struct app_context *ctx, const struct irc_message *msg)
 	if (buffer)
 	{
 		buffer_send (ctx, buffer, BUFFER_LINE_QUIT, 0,
-			msg->prefix, message, "");
+			msg->prefix, message, "%s", "");
 
 		// TODO: set some kind of a flag in the buffer and when the user
 		//   reappers on a channel (JOIN), log a "is back online" message.
@@ -2205,7 +2205,7 @@ irc_handle_quit (struct app_context *ctx, const struct irc_message *msg)
 		buffer = str_map_find (&ctx->irc_buffer_map, iter->channel->name);
 		if (buffer)
 			buffer_send (ctx, buffer, BUFFER_LINE_QUIT, 0,
-				msg->prefix, message, "");
+				msg->prefix, message, "%s", "");
 
 		// This destroys "iter" which doesn't matter to us
 		irc_remove_user_from_channel (user, iter->channel);