diff --git a/Makefile b/Makefile
index 4af87e26..ca01fcac 100644
--- a/Makefile
+++ b/Makefile
@@ -46,3 +46,12 @@ obj-$(CONFIG_MARS_LIGHT)	+= sy_old/mars_light.o \
 ifdef CONFIG_DEBUG_KERNEL
 KBUILD_CFLAGS += -fno-inline-functions -fno-inline-small-functions -fno-inline-functions-called-once
 endif
+
+.PHONY FORCE: block/mars/buildtag.h
+block/mars/buildtag.h:
+	set -e; exec > $@;\
+	cd block/mars;\
+	echo -e "/* Automatically generated -- DO NOT EDIT! */";\
+	echo -e "#define BUILDTAG  \"$$(git log -1 --pretty='format:%H')\"";\
+	echo -e "#define BUILDHOST \"$$USER@$$HOSTNAME\"";\
+	echo -e "#define BUILDDATE \"$$(date '+%F %T')\""
diff --git a/sy_old/mars_light.c b/sy_old/mars_light.c
index 2f0eadca..96f292eb 100644
--- a/sy_old/mars_light.c
+++ b/sy_old/mars_light.c
@@ -25,6 +25,7 @@
 #include <linux/blkdev.h>
 
 #include "strategy.h"
+#include "../buildtag.h"
 
 #include <linux/kthread.h>
 #include <linux/wait.h>
@@ -3097,6 +3098,7 @@ const void *dummy2 = &server_brick_type;
 
 MODULE_DESCRIPTION("MARS Light");
 MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
+MODULE_VERSION(BUILDTAG " (" BUILDHOST BUILDDATE ")");
 MODULE_LICENSE("GPL");
 
 module_init(init_light);