diff --git a/src/ntwxwin.mak b/src/ntwxwin.mak
index 39bc88294f..ee115d6e0e 100644
--- a/src/ntwxwin.mak
+++ b/src/ntwxwin.mak
@@ -121,7 +121,7 @@ OPTIONS=
 !if "$(FINAL)" == "0"
 OPT = /Od /Gy
 # ***N.B.*** to save space/time, comment out /FR to avoid browse info (.sbr files) being generated
-DEBUG_FLAGS= /Zi # /FR
+DEBUG_FLAGS= /Zi /D__WXDEBUG__ /DWXDEBUG=1 # /FR
 LINK_DEBUG_FLAGS=-debug:full -debugtype:cv # /PDB:NONE
 CRTFLAG=/MD
 !else
@@ -145,9 +145,9 @@ PRECOMP=/YuWX/WXPREC.H /Fp$(WXDIR)\src\msw\$(PCH) /Fd$(WXDIR)\lib\wx.pdb
 MAKEPRECOMP=/YcWX/WXPREC.H
 !endif
 
-CPPFLAGS=$(WINFLAGS) $(DEBUG_FLAGS) $(PRECOMP) $(EXTRAFLAGS) /D__WXMSW__ /DDEBUG=1 $(INC) $(OPT) $(EXTRADLLFLAGS)  $(CRTFLAG) /D__WINDOWS__ /GX /D__WXDEBUG__ /DWXDEBUG=1 /DSTRICT
+CPPFLAGS=$(WINFLAGS) $(DEBUG_FLAGS) $(PRECOMP) $(EXTRAFLAGS) /D__WXMSW__ /DDEBUG=1 $(INC) $(OPT) $(EXTRADLLFLAGS)  $(CRTFLAG) /D__WINDOWS__ /GX /DSTRICT
 # If you don't include wxprec.h, use CPPFLAGS2
-CPPFLAGS2=$(WINFLAGS) $(DEBUG_FLAGS) /D__WXMSW__ /DDEBUG=1 $(INC) $(EXTRAFLAGS) $(OPT) $(EXTRADLLFLAGS) $(CRTFLAG) /D__WINDOWS__ /GX /D__WXDEBUG__ /DWXDEBUG=1 /DSTRICT
+CPPFLAGS2=$(WINFLAGS) $(DEBUG_FLAGS) /D__WXMSW__ /DDEBUG=1 $(INC) $(EXTRAFLAGS) $(OPT) $(EXTRADLLFLAGS) $(CRTFLAG) /D__WINDOWS__ /GX /DSTRICT
 LINKFLAGS=$(LINK_DEBUG_FLAGS) $(WINLINKFLAGS) -entry:WinMainCRTStartup
 DUMMY=dummy