diff --git a/src/Wxwindll.icc b/src/Wxwindll.icc
index 7f7ff53193..b2e46a3bc8 100644
--- a/src/Wxwindll.icc
+++ b/src/Wxwindll.icc
@@ -32,6 +32,8 @@ option ProjectOptions = lang(longlong, "yes"),  gen(manglelinkagekeywordonlyfunc
    {
        run before '-mkdir ' '..\\src\\common\\dbgos240dll'
        run before '-mkdir ' '..\\samples\\minimal\\dbgos240dll'
+       run before 'copy ' '..\\src\common\\dosyacc.c ' '..\\src\\common\\y_tab.c'
+       run before 'copy ' '..\\src\common\\doslex.c ' '..\\src\\common\\lex_yy.c'
    }
    target type("dll") "..\\lib\\Wxwindll.dll"
    {
diff --git a/src/wxWin.icc b/src/wxWin.icc
index 011b8eb501..2d60341ff1 100644
--- a/src/wxWin.icc
+++ b/src/wxWin.icc
@@ -16,6 +16,8 @@ option ProjectOptions = gen(arch, "pentium2"), lang(longlong, "yes"),  gen(mangl
    perform
    {
        run before '-mkdir ' '..\\src\\common\\dbgos240'
+       run before 'copy ' '..\\src\common\\dosyacc.c ' '..\\src\\common\\y_tab.c'
+       run before 'copy ' '..\\src\common\\doslex.c ' '..\\src\\common\\lex_yy.c'
    }
    target type("lib") "..\\LIB\\wx40.lib"
    {