diff --git a/tests/test.cpp b/tests/test.cpp
index 6619dd21c5..5225ce76b1 100644
--- a/tests/test.cpp
+++ b/tests/test.cpp
@@ -472,6 +472,8 @@ bool TestApp::OnInit()
     if ( !TestAppBase::OnInit() )
         return false;
 
+    SetCLocale();
+
 #if wxUSE_GUI
     cout << "Test program for wxWidgets GUI features\n"
 #else