diff -urNad device3dfx.orig/device3dfx-2013.08.08/debian/rules device3dfx/device3dfx-2013.08.08/debian/rules
--- device3dfx.orig/device3dfx-2013.08.08/debian/rules	2015-02-12 12:28:38.711013848 +0000
+++ device3dfx/device3dfx-2013.08.08/debian/rules	2015-02-12 12:30:35.615998066 +0000
@@ -13,6 +13,8 @@
 psource = $(pname)-source
 pmodule = $(pname)-module
 
+BUILD_DATE := $(shell dpkg-parsechangelog --show-field Date)
+
 build-indep build-arch build:
 
 .PHONY: build-indep build-arch build
@@ -41,7 +43,7 @@
 	cp -R debian/source $(target)/debian
 	chown -R root.root $(target)
 	chmod +x $(target)/debian/rules
-	tar -C debian/$(psource)/usr/src -cvJf debian/$(psource)/usr/src/$(pname).tar.xz modules/$(pname)
+	tar --mtime="$(BUILD_DATE)" -C debian/$(psource)/usr/src -cvJf debian/$(psource)/usr/src/$(pname).tar.xz modules/$(pname)
 	rm -r debian/$(psource)/usr/src/modules
 
 testmodule: install