diff --git a/include/wx/display.h b/include/wx/display.h
index 0714805e5c..835a233b23 100644
--- a/include/wx/display.h
+++ b/include/wx/display.h
@@ -12,7 +12,7 @@
 #ifndef _WX_DISPLAY_H_BASE_
 #define _WX_DISPLAY_H_BASE_
 
-#ifdef wxUSE_DISPLAY
+#if wxUSE_DISPLAY
 
 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
     #pragma interface "displaybase.h"
diff --git a/setup.h_vms b/setup.h_vms
index 2801e72fda..e3f32117d2 100644
--- a/setup.h_vms
+++ b/setup.h_vms
@@ -434,7 +434,7 @@
 /*
  * Use wxDisplay class
  */
-#define wxUSE_DISPLAY !
+#define wxUSE_DISPLAY 1
 
 /*
  * Use this control
diff --git a/src/common/dpycmn.cpp b/src/common/dpycmn.cpp
index e8072554a7..8797f81ecb 100644
--- a/src/common/dpycmn.cpp
+++ b/src/common/dpycmn.cpp
@@ -30,7 +30,7 @@
 
 #include "wx/display.h"
 
-#ifdef wxUSE_DISPLAY
+#if wxUSE_DISPLAY
 
 #include "wx/arrimpl.cpp"
 WX_DEFINE_OBJARRAY(wxArrayVideoModes);