diff --git a/setup.h.in b/setup.h.in
index 4fcf5acb97..e85a97fa61 100644
--- a/setup.h.in
+++ b/setup.h.in
@@ -775,14 +775,14 @@
  */
 #define wxUSE_SPLINES 0
 
+/*
+ * Use MDI.
+ */
+#define wxUSE_MDI 0
 /*
  * Use the mdi architecture
  */
 #define wxUSE_MDI_ARCHITECTURE 0
-/*
- * Use MDI
- */
-#define wxUSE_MDI 0
 /*
  * Use the document/view architecture
  */
diff --git a/setup.h_vms b/setup.h_vms
index d8a7c87915..23bd824e11 100644
--- a/setup.h_vms
+++ b/setup.h_vms
@@ -794,6 +794,10 @@
  */
 #define wxUSE_SPLINES 1
 
+/*
+ * Use MDI.
+ */
+#define wxUSE_MDI 1
 /*
  * Use the mdi architecture
  */