diff --git a/.bashrc b/.bashrc
index 4a61f30..6a45046 100644
--- a/.bashrc
+++ b/.bashrc
@@ -44,6 +44,7 @@ export LESS="-EfmrSwX"
 export LSCOLORS="gxfxcxdxbxegedabagacad"
 export PATH="$HOME/bin:$HOME/.local/bin:$HOME/.config/composer/vendor/bin:$HOME/node_modules/.bin:/usr/local/sbin:/usr/sbin:/sbin:$PATH"
 export PERL_CPANM_OPT="--mirror http://cpan.nctu.edu.tw/ --mirror http://cpan.cpantesters.org/"
+export PYTHONDONTWRITEBYTECODE=yes
 export QUILT_PATCHES="debian/patches"
 #
 # Hack for gnome-terminal
diff --git a/.zshrc b/.zshrc
index 502fee1..1ef16c7 100644
--- a/.zshrc
+++ b/.zshrc
@@ -127,6 +127,7 @@ export HOMEBREW_NO_ANALYTICS=1
 export LESS="-EfmrSwX"
 export LSCOLORS="gxfxcxdxbxegedabagacad"
 export PATH="$HOME/bin:$HOME/.local/bin:$HOME/.config/composer/vendor/bin:$HOME/node_modules/.bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH"
+export PYTHONDONTWRITEBYTECODE=yes
 export QUILT_PATCHES="debian/patches"
 export SAVEHIST=2000
 #