diff --git a/src/transliterate/contrib/languages/el/data/default.py b/src/transliterate/contrib/languages/el/data/default.py
index 0d452f0..d463a5a 100644
--- a/src/transliterate/contrib/languages/el/data/default.py
+++ b/src/transliterate/contrib/languages/el/data/default.py
@@ -43,8 +43,6 @@
     u"eu": u"ευ",
     u"Ou": u"Ου",
     u"ou": u"ου",
-    u"Oy": u"Ου",
-    u"oy": u"ου",
     u"U": u"Υ",
     u"u": u"υ",
     u"Yi": u"Υι",