diff --git a/package.env/all b/package.env/all
index d162d02..f09052d 100644
--- a/package.env/all
+++ b/package.env/all
@@ -10,5 +10,6 @@ mail-filter/razor noparallelmake
 media-fonts/acroread-asianfonts aslang
 media-gfx/darktable p4cpu
 media-gfx/rawtherapee o3
+sys-libs/zlib noparallelmake
 www-client/firefox-bin aslang
 www-client/opera aslang