diff --git a/distrib/msw/tmake/vc6base.t b/distrib/msw/tmake/vc6base.t
index 5e74fbe9b2..def3c4434f 100644
--- a/distrib/msw/tmake/vc6base.t
+++ b/distrib/msw/tmake/vc6base.t
@@ -97,7 +97,7 @@ LIB32=link.exe -lib
 # PROP Intermediate_Dir "BaseDebug"
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /MD /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MT" /YX /FD /c
-# ADD CPP /nologo /MDd /W4 /Zi /Od /I "$(wx)\include" /I "$(wx)\src\zlib" /D "_DEBUG" /D DEBUG=1 /D WXDEBUG=1 /D "__WXDEBUG__" /D wxUSE_GUI=0 /D "__WIN95__" /D "WIN32" /D "_WIN32" /D WINVER=0x400 /D "__WINDOWS__" /D "__WIN32__" /D "__WXMSW__" /D "_MT" /Fr /Yu"wx/wxprec.h" /FD /c
+# ADD CPP /nologo /MDd /W4 /Zi /Od /I "$(wx)\include" /I "$(wx)\src\zlib" /D "_DEBUG" /D DEBUG=1 /D WXDEBUG=1 /D "__WXDEBUG__" /D wxUSE_GUI=0 /D "__WIN95__" /D "WIN32" /D "_WIN32" /D WINVER=0x400 /D "__WINDOWS__" /D "__WIN32__" /D "__WXMSW__" /D "_MT" /Yu"wx/wxprec.h" /FD /c
 # ADD BASE RSC /l 0x409
 # ADD RSC /l 0x409
 BSC32=bscmake.exe
diff --git a/wxBase.dsp b/wxBase.dsp
index 7748a83922..b8e860264e 100644
--- a/wxBase.dsp
+++ b/wxBase.dsp
@@ -64,7 +64,7 @@ LIB32=link.exe -lib
 # PROP Intermediate_Dir "BaseDebug"
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /MD /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MT" /YX /FD /c
-# ADD CPP /nologo /MDd /W4 /Zi /Od /I "$(wx)\include" /I "$(wx)\src\zlib" /D "_DEBUG" /D DEBUG=1 /D WXDEBUG=1 /D "__WXDEBUG__" /D wxUSE_GUI=0 /D "__WIN95__" /D "WIN32" /D "_WIN32" /D WINVER=0x400 /D "__WINDOWS__" /D "__WIN32__" /D "__WXMSW__" /D "_MT" /Fr /Yu"wx/wxprec.h" /FD /c
+# ADD CPP /nologo /MDd /W4 /Zi /Od /I "$(wx)\include" /I "$(wx)\src\zlib" /D "_DEBUG" /D DEBUG=1 /D WXDEBUG=1 /D "__WXDEBUG__" /D wxUSE_GUI=0 /D "__WIN95__" /D "WIN32" /D "_WIN32" /D WINVER=0x400 /D "__WINDOWS__" /D "__WIN32__" /D "__WXMSW__" /D "_MT" /Yu"wx/wxprec.h" /FD /c
 # ADD BASE RSC /l 0x409
 # ADD RSC /l 0x409
 BSC32=bscmake.exe