diff --git a/.config/shell/env b/.config/shell/env
index baef1bf..0c9dbe8 100644
--- a/.config/shell/env
+++ b/.config/shell/env
@@ -32,8 +32,10 @@ doom_bin_dir="${XDG_DATA_HOME:-$HOME/.config}/emacs/bin"
 if [ -d "$doom_bin_dir" ]; then export PATH="$PATH:$doom_bin_dir"; fi
 unset doom_bin_dir
 
-# Shell to use for commands like `nix-shell -p`
-export NIX_BUILD_SHELL=zsh
+# Shell to use for commands like `nix-shell -p` (use zsh if using zsh)
+if test -n "${ZSH_VERSION:-}"; then
+   export NIX_BUILD_SHELL=zsh
+fi
 
 # Basic default LS colors
 export LSCOLORS="Gxfxcxdxbxegedabagacad"