diff --git a/langcoder.cc b/langcoder.cc
index 6c3276bf7..a62e30092 100644
--- a/langcoder.cc
+++ b/langcoder.cc
@@ -357,7 +357,13 @@ bool LangCoder::isLanguageRTL( quint32 code )
   {
     LangCode &lc = LangCodes[ langCoder.codeMap[ code ] ];
     if( lc.isRTL < 0 )
+    {
+#if QT_VERSION >= 0x040700
       lc.isRTL = ( int )( QLocale( lc.code ).textDirection() == Qt::RightToLeft );
+#else
+      lc.isRTL = 0;
+#endif
+    }
     return lc.isRTL != 0;
   }