diff --git a/lib/domains/blacklist.txt b/lib/domains/blacklist.txt
index d587b43066..eab7d1410e 100644
--- a/lib/domains/blacklist.txt
+++ b/lib/domains/blacklist.txt
@@ -14,4 +14,5 @@ my.edu.moi
 art.edu.lv
 aaedu.edu.pl
 k.tut.edu.pl
-uno.edu.gr
\ No newline at end of file
+uno.edu.gr
+mdu.edu.rs
\ No newline at end of file