diff --git a/dotfiles/environment.sh b/dotfiles/environment.sh
index 0aa2a85..6fb9d5e 100644
--- a/dotfiles/environment.sh
+++ b/dotfiles/environment.sh
@@ -5,3 +5,9 @@ export GIT_AUTHOR_NAME="mj"
 export GIT_AUTHOR_EMAIL="mj@str8.biz"
 export GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
 export GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL
+
+# gzip:
+export GZIP = -9
+
+# 7z, xz, lzma:
+export XZ_OPT = -9