diff --git a/src/mmg/mmg.cpp b/src/mmg/mmg.cpp
index 04a8de226..f23d59674 100644
--- a/src/mmg/mmg.cpp
+++ b/src/mmg/mmg.cpp
@@ -115,11 +115,11 @@ mmg_app::init_ui_locale() {
     std::string installation_path = get_installation_path();
     if (!installation_path.empty())
       wxLocale::AddCatalogLookupPathPrefix(wxU(installation_path + "/locale"));
-  }
 
-  const wxLanguageInfo *lang_info = wxLocale::FindLanguageInfo(wxU(m_ui_locale));
-  if (s_first_init) {
-    if (lang_info && m_locale.Init(lang_info->Language)) {
+    auto lang_info = !m_ui_locale.empty() ? wxLocale::FindLanguageInfo(wxU(m_ui_locale)) : nullptr;
+    auto language  = lang_info            ? lang_info->Language                          : wxLANGUAGE_ENGLISH;
+
+    if (lang_info && m_locale.Init(language)) {
       m_locale.AddCatalog(wxU("wxstd"));
 #ifdef SYS_WINDOWS
       m_locale.AddCatalog(wxU("wxmsw"));