diff --git a/tools/firmware/etherboot/Makefile b/tools/firmware/etherboot/Makefile
index 89d9ace8c8..e33458d2fe 100644
--- a/tools/firmware/etherboot/Makefile
+++ b/tools/firmware/etherboot/Makefile
@@ -31,7 +31,7 @@ $T:
 	if ! $(FETCHER) _$T $(IPXE_TARBALL_URL); then \
 		$(GIT) clone $(IPXE_GIT_URL) $D.git; \
 		(cd $D.git && $(GIT) archive --format=tar --prefix=$D/ \
-		$(IPXE_GIT_TAG) | gzip >../_$T); \
+		$(IPXE_GIT_TAG) | gzip -n >../_$T); \
 		rm -rf $D.git; \
 	fi
 	mv _$T $T
diff --git a/tools/firmware/etherboot/README b/tools/firmware/etherboot/README
index c1c713c76b..5e3c1daf58 100644
--- a/tools/firmware/etherboot/README
+++ b/tools/firmware/etherboot/README
@@ -15,7 +15,7 @@ as on 25th September 2008):
 
  git clone git://git.etherboot.org/scm/gpxe.git
  cd gpxe
- git archive --format=tar --prefix=gpxe/ c24bc349ead939d90b5784dbff3cd9fdb9d83ba8 | gzip >../gpxe-git-snapshot.tar.gz
+ git archive --format=tar --prefix=gpxe/ c24bc349ead939d90b5784dbff3cd9fdb9d83ba8 | gzip -n >../gpxe-git-snapshot.tar.gz
 
 ----------------------------------------