diff --git a/src/mkvtoolnix-gui/util/settings.cpp b/src/mkvtoolnix-gui/util/settings.cpp
index 59d56b100..b77273167 100644
--- a/src/mkvtoolnix-gui/util/settings.cpp
+++ b/src/mkvtoolnix-gui/util/settings.cpp
@@ -475,7 +475,8 @@ Settings::setDefaults(std::optional<QVariant> enableMuxingTracksByTheseTypes) {
 
   if (m_recognizedTrackLanguagesInFileNames.isEmpty())
     for (auto const &language : mtx::iso639::g_languages)
-      m_recognizedTrackLanguagesInFileNames << Q(language.alpha_3_code);
+      if (!language.alpha_2_code.empty())
+        m_recognizedTrackLanguagesInFileNames << Q(language.alpha_3_code);
 
   if (m_regexForDerivingTrackLanguagesFromFileNames.isEmpty())
     m_regexForDerivingTrackLanguagesFromFileNames = mtx::gui::Merge::SourceFile::defaultRegexForDerivingLanguageFromFileName();