diff --git a/development/scons/SConstruct b/development/scons/SConstruct
index 0253745a6d..e799e0ffc9 100644
--- a/development/scons/SConstruct
+++ b/development/scons/SConstruct
@@ -1640,6 +1640,7 @@ if build_qt2:
 
     # load qt2 tools
     qt2env.Tool('qt')
+    qt2env['QT_UICDECLFLAGS'] = '-tr lyx::qt_'
 
     qt2env.AppendUnique(CPPPATH = [
         '$BUILDDIR/common',