diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index b6c2d46..8e53956 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -719,7 +719,7 @@
 !include Make_all.mak
 !include testdir\Make_all.mak
 
-INCL =	vim.h alloc.h ascii.h ex_cmds.h feature.h globals.h \
+INCL =	vim.h alloc.h ascii.h ex_cmds.h feature.h errors.h globals.h \
 	keymap.h macros.h option.h os_dos.h os_win32.h proto.h regexp.h \
 	spell.h structs.h term.h beval.h $(NBDEBUG_INCL)