diff --git a/docs/changes.txt b/docs/changes.txt
index fab00ba096..fdbc5cb67f 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -63,6 +63,12 @@ Changes in behaviour not resulting in compilation errors
   mode under MSW, use the new AreAppsDark() or IsSystemDark() to check if the
   other applications or the system are using dark mode.
 
+- wxUILocale::IsSupported() now returns false for unavailable locales under
+  Unix systems without trying to fall back on another locale using the same
+  language in a different region, e.g. it doesn't use fr_FR if fr_BE is not
+  available. If any locale using the given language is acceptable, the region
+  must be left empty, e.g. just "fr" would use any available "fr_XX".
+
 
 Changes in behaviour which may result in build errors
 -----------------------------------------------------
diff --git a/src/unix/uilocale.cpp b/src/unix/uilocale.cpp
index b9ef63865f..d5583d902d 100644
--- a/src/unix/uilocale.cpp
+++ b/src/unix/uilocale.cpp
@@ -272,11 +272,11 @@ locale_t TryCreateLocaleWithUTF8(wxLocaleIdent& locId)
 locale_t TryCreateMatchingLocale(wxLocaleIdent& locId)
 {
     locale_t loc = TryCreateLocaleWithUTF8(locId);
-    if ( !loc )
+    if ( !loc && locId.GetRegion().empty() )
     {
-        // Try to find a variant of this locale available on this system: first
-        // of all, using just the language, without the territory, typically
-        // does _not_ work under Linux, so try adding one if we don't have it.
+        // Try to find a variant of this locale available on this system: as
+        // using just the language, without the territory, typically does _not_
+        // work under Linux, we try adding one if we don't have it.
         const wxString lang = locId.GetLanguage();
 
         const wxLanguageInfos& infos = wxGetLanguageInfos();