diff --git a/data/language/eo-OO.txt b/data/language/eo-ZZ.txt
similarity index 100%
rename from data/language/eo-OO.txt
rename to data/language/eo-ZZ.txt
diff --git a/src/openrct2/localisation/Language.cpp b/src/openrct2/localisation/Language.cpp
index 59aa3e67a4..9794823c31 100644
--- a/src/openrct2/localisation/Language.cpp
+++ b/src/openrct2/localisation/Language.cpp
@@ -33,7 +33,7 @@ const language_descriptor LanguagesDescriptors[LANGUAGE_COUNT] =
     { "de-DE", "German",                "Deutsch",               FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_GERMAN
     { "en-GB", "English (UK)",          "English (UK)",          FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_ENGLISH_UK
     { "en-US", "English (US)",          "English (US)",          FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_ENGLISH_US
-    { "eo-OO", "Esperanto",             "Esperanto",             FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_ESPERANTO
+    { "eo-ZZ", "Esperanto",             "Esperanto",             FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_ESPERANTO
     { "es-ES", "Spanish",               u8"Español",             FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_SPANISH
     { "fr-FR", "French",                u8"Français",            FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_FRENCH
     { "it-IT", "Italian",               "Italiano",              FAMILY_OPENRCT2_SPRITE,                false }, // LANGUAGE_ITALIAN