diff --git a/zshenv b/zshenv
index c1e09a3..ee5bcb3 100644
--- a/zshenv
+++ b/zshenv
@@ -3,4 +3,8 @@ export GPG_TTY=$(tty)
 
 fpath+=(~/.zsh/completions)
 
-. "$HOME/.cargo/env"
+# Setup cargo
+[[ ! -f ~/.cargo/env ]] || source ~/.cargo/env
+
+# Source machine-specific environment
+[[ ! -f ~/.zshenv.local ]] || source ~/.zshenv.local