diff --git a/include/Makefile b/include/Makefile
index 6fdef2a76a78..8d86a62c9081 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -5,7 +5,7 @@
 
 CLEANFILES= osreldate.h version vers.c
 SUBDIR= arpa protocols rpcsvc rpc
-INCS=	_ctype.h a.out.h ar.h assert.h bitstring.h complex.h cpio.h ctype.h \
+INCS=	a.out.h ar.h assert.h bitstring.h complex.h cpio.h _ctype.h ctype.h \
 	db.h \
 	dirent.h dlfcn.h elf.h elf-hints.h err.h fmtmsg.h fnmatch.h fstab.h \
 	fts.h ftw.h getopt.h glob.h grp.h \