diff --git a/bash/.bashrc b/bash/.bashrc
index 0d486a8..18319d3 100644
--- a/bash/.bashrc
+++ b/bash/.bashrc
@@ -23,15 +23,19 @@ fi
 
 export PS1="${green}"'\$'"${no_color} "
 export DIRENV_PS1="${red}"'\$'"${no_color} "
+export NIX_SHELL_PS1="${blue}"'λ'"${no_color} "
 if [ "${HOSTNAME}" != "crypt" ] && [ "${HOSTNAME}" != "tomb" ] || [ "${SSH_TTY}" != "" ]; then
   DIRENV_PS1="${DIRENV_PS1}${blue}${HOSTNAME} ${DIRENV_PS1}"
+  NIX_SHELL_PS1="${NIX_SHELL_PS1}${green}${HOSTNAME} ${NIX_SHELL_PS1}"
   PS1="${PS1}${blue}${HOSTNAME} ${PS1}"
 fi
 export ORIG_PS1=${PS1}
 
 if which direnv &> /dev/null; then
   update_prompt() {
-    if direnv status | grep -iEq 'RC allowed (true|0)'; then
+    if [ -n "${IN_NIX_SHELL}" ]; then
+      PS1=${NIX_SHELL_PS1}
+    elif direnv status | grep -iEq 'RC allowed (true|0)'; then
       PS1=${DIRENV_PS1}
     else
       PS1=${ORIG_PS1}