diff --git a/zyklonb.c b/zyklonb.c
index fde8a02..806de8b 100644
--- a/zyklonb.c
+++ b/zyklonb.c
@@ -1484,7 +1484,8 @@ on_irc_timeout (void *user_data)
 {
 	// Provoke a response from the server
 	struct bot_context *ctx = user_data;
-	irc_send (ctx, "PING :%s", str_map_find (&ctx->config, "nickname"));
+	irc_send (ctx, "PING :%s",
+		(char *) str_map_find (&ctx->config, "nickname"));
 }
 
 static void