diff --git a/src/generic/calctrlg.cpp b/src/generic/calctrlg.cpp
index b7f7a0e6f5..e6f1b35cf7 100644
--- a/src/generic/calctrlg.cpp
+++ b/src/generic/calctrlg.cpp
@@ -47,7 +47,7 @@
 // wxWin macros
 // ----------------------------------------------------------------------------
 
-#if wxHAS_NATIVE_CALENDARCTRL
+#ifdef wxHAS_NATIVE_CALENDARCTRL
 
 IMPLEMENT_DYNAMIC_CLASS_XTI(wxGenericCalendarCtrl, wxControl,"wx/calctrl.h")