diff --git a/dos/Makefile b/dos/Makefile
index 3a02899..0ddb43c 100644
--- a/dos/Makefile
+++ b/dos/Makefile
@@ -113,6 +113,7 @@
 	../src/xz/list.c \
 	../src/xz/main.c \
 	../src/xz/message.c \
+	../src/xz/mytime.c \
 	../src/xz/options.c \
 	../src/xz/signals.c \
 	../src/xz/suffix.c \