diff --git a/Source/MediaInfo/MediaInfo_Config_Automatic.cpp b/Source/MediaInfo/MediaInfo_Config_Automatic.cpp
index e3654d92ea..dd9196a6c4 100644
--- a/Source/MediaInfo/MediaInfo_Config_Automatic.cpp
+++ b/Source/MediaInfo/MediaInfo_Config_Automatic.cpp
@@ -870,6 +870,7 @@ void MediaInfo_Config_DefaultLanguage (Translation &Info)
     "Language_mg;Malagasy\n"
     "Language_mh;Marshallese\n"
     "Language_mi;Maori\n"
+    "Language_mis;Uncoded languages\n"
     "Language_mk;Macedonian\n"
     "Language_ml;Malayalam\n"
     "Language_mn;Mongolian\n"
@@ -946,6 +947,7 @@ void MediaInfo_Config_DefaultLanguage (Translation &Info)
     "Language_ty;Tahitian\n"
     "Language_ug;Uighur\n"
     "Language_uk;Ukrainian\n"
+    "Language_und;Undetermined\n"
     "Language_ur;Urdu\n"
     "Language_uz;Uzbek\n"
     "Language_ve;Venda\n"
@@ -968,6 +970,7 @@ void MediaInfo_Config_DefaultLanguage (Translation &Info)
     "Language_zh-Hans;Chinese (Simplified)\n"
     "Language_zh-Hant;Chinese (Traditional)\n"
     "Language_zu;Zulu\n"
+    "Language_zxx;No linguistic content or not applicable\n"
     "LawRating;Law rating\n"
     "LCCN;LCCN\n"
     "LfeAttenuationKnown;LFE attenuation known\n"
diff --git a/Source/Resource/Text/Language/DefaultLanguage.csv b/Source/Resource/Text/Language/DefaultLanguage.csv
index e2a0c4b15d..0cd6121ada 100644
--- a/Source/Resource/Text/Language/DefaultLanguage.csv
+++ b/Source/Resource/Text/Language/DefaultLanguage.csv
@@ -841,6 +841,7 @@ Language_lv;Latvian
 Language_mg;Malagasy
 Language_mh;Marshallese
 Language_mi;Maori
+Language_mis;Uncoded languages
 Language_mk;Macedonian
 Language_ml;Malayalam
 Language_mn;Mongolian
@@ -917,6 +918,7 @@ Language_tw;Twi
 Language_ty;Tahitian
 Language_ug;Uighur
 Language_uk;Ukrainian
+Language_und;Undetermined
 Language_ur;Urdu
 Language_uz;Uzbek
 Language_ve;Venda
@@ -939,6 +941,7 @@ Language_zh-yue;Cantonese
 Language_zh-Hans;Chinese (Simplified)
 Language_zh-Hant;Chinese (Traditional)
 Language_zu;Zulu
+Language_zxx;No linguistic content or not applicable
 LawRating;Law rating
 LCCN;LCCN
 LfeAttenuationKnown;LFE attenuation known