diff --git a/build/bakefiles/common.bkl b/build/bakefiles/common.bkl
index 99b0bd578b..b83a738fb4 100644
--- a/build/bakefiles/common.bkl
+++ b/build/bakefiles/common.bkl
@@ -261,6 +261,11 @@
         <if cond="FORMAT!='autoconf' and UNICODE=='1'">_UNICODE</if>
     </set>
 
+    <!-- fill for the specific case of the format/compiler -->
+    <set var="WIN32_WINNT">
+        <if cond="FORMAT=='dmars' or FORMAT=='dmars_smake'">_WIN32_WINNT=0x0400</if>
+    </set>
+
     <set var="UNICOWS_LIB">
         <if cond="MSLU=='1'">unicows</if>
     </set>
@@ -277,6 +282,7 @@
             <cppflags>$(EXTRACFLAGS)</cppflags>
         </if>
         <define>$(NO_VC_CRTDBG)</define>
+        <define>$(WIN32_WINNT)</define>
     </template>
 
     <template id="anylib">
diff --git a/include/wx/msw/missing.h b/include/wx/msw/missing.h
index 1c413a3462..f5ac200557 100644
--- a/include/wx/msw/missing.h
+++ b/include/wx/msw/missing.h
@@ -520,14 +520,9 @@ typedef struct {
 
 #ifdef __DMC__
 
-  typedef struct tagTRACKMOUSEEVENT {
-      DWORD cbSize;
-      DWORD dwFlags;
-      HWND  hwndTrack;
-      DWORD dwHoverTime;
-  } TRACKMOUSEEVENT, *LPTRACKMOUSEEVENT;
-
-  WINCOMMCTRLAPI BOOL WINAPI _TrackMouseEvent(LPTRACKMOUSEEVENT lpEventTrack);
+    #ifndef _TrackMouseEvent
+        #define _TrackMouseEvent TrackMouseEvent
+    #endif
 
 #endif