diff --git a/degesch.c b/degesch.c
index d16b6af..23d5124 100644
--- a/degesch.c
+++ b/degesch.c
@@ -1045,7 +1045,6 @@ struct server
 
 	// Server-specific information (from RPL_ISUPPORT):
 
-	// TODO: implement a generic strcmp() on top of "irc_tolower"
 	/// Convert an IRC identifier character to lower-case
 	int (*irc_tolower) (int);
 
@@ -3647,6 +3646,16 @@ refresh_prompt (struct app_context *ctx)
 
 // --- Helpers -----------------------------------------------------------------
 
+static int
+irc_server_strcmp (struct server *s, const char *a, const char *b)
+{
+	int x;
+	while (*a || *b)
+		if ((x = s->irc_tolower (*a++) - s->irc_tolower (*b++)))
+			return x;
+	return 0;
+}
+
 static char *
 irc_cut_nickname (const char *prefix)
 {
@@ -3669,7 +3678,7 @@ irc_is_this_us (struct server *s, const char *prefix)
 		return false;
 
 	char *nick = irc_cut_nickname (prefix);
-	bool result = !irc_strcmp (nick, s->irc_user->nickname);
+	bool result = !irc_server_strcmp (s, nick, s->irc_user->nickname);
 	free (nick);
 	return result;
 }