diff --git a/zshrc b/zshrc
index 15c1a7a..77b5270 100644
--- a/zshrc
+++ b/zshrc
@@ -220,6 +220,8 @@ done
 __has_command vim && alias vi=vim
 __has_command gpg2 && alias gpg=gpg2
 
+__has_command nproc && export MAKEFLAGS="-j$(($(nproc) * 2))"
+
 make() {
 	case "$PWD" in
 		# pkgsrc needs bmake and does not like MAKEFLAGS including -j.