diff --git a/kernel/Makefile b/kernel/Makefile
index bea51f22c..ae199c5ec 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -37,13 +37,16 @@ MAN=
 debug.d: extracted-errno.h extracted-mfield.h extracted-mtype.h
 
 extracted-errno.h: extract-errno.sh ../include/errno.h
-	sh extract-errno.sh > extracted-errno.h
+	${_MKTARGET_CREATE}
+	cd ${.CURDIR} ; sh extract-errno.sh > ${.OBJDIR}/extracted-errno.h
 
 extracted-mfield.h: extract-mfield.sh ../lib/libc/other/*.c ../lib/libc/posix/*.c ../lib/libsys/*.c
-	sh extract-mfield.sh > extracted-mfield.h
+	${_MKTARGET_CREATE}
+	cd ${.CURDIR} ; sh extract-mfield.sh > ${.OBJDIR}/extracted-mfield.h
 
 extracted-mtype.h: extract-mtype.sh ../include/minix/com.h
-	sh extract-mtype.sh > extracted-mtype.h
+	${_MKTARGET_CREATE}
+	cd ${.CURDIR} ; sh extract-mtype.sh > ${.OBJDIR}/extracted-mtype.h
 
 clean:
 	rm -f extracted-errno.h extracted-mfield.h extracted-mtype.h