diff --git a/Makefile b/Makefile
index a71db8c5d708c4a443a02fc2f56794b8add740ca..8a6615311e746028150efd142b9f3558bd5418d0 100644
--- a/Makefile
+++ b/Makefile
@@ -75,12 +75,12 @@ deploy: all
 	make -C practical_work/planets
 	cp practical_work/planets/*.pdf phys/planets/
 	cp practical_work/planets/*.html phys/planets/
-	cd practical_work/planets && tar czvf skeleton.tar.gz skeleton && cp *.gz ../../phys/planets
+	cd practical_work/planets && tar cvf skeleton.tar skeleton && cp *.tar ../../phys/planets
 	cd ..
 	make -C practical_work/electric_fl
 	cp practical_work/electric_fl/*.pdf phys/field_lines/
 	cp practical_work/electric_fl/*.html phys/field_lines/
-	cd practical_work/electric_fl && tar czvf utils_jour.tar.gz utils Jour && tar czvf utils_soir.tar.gz utils Soir && cp *.gz ../../phys/field_lines
+	cd practical_work/electric_fl && tar cvf utils_jour.tar utils Jour && tar cvf utils_soir.tar utils Soir && cp *.tar ../../phys/field_lines
 
 
 clean: