diff --git a/nix/home-manager/programs/zsh.nix b/nix/home-manager/programs/zsh.nix
index 112f336..f5475aa 100644
--- a/nix/home-manager/programs/zsh.nix
+++ b/nix/home-manager/programs/zsh.nix
@@ -43,8 +43,10 @@ in {
     # will be called again by oh-my-zsh
     enableCompletion = false;
     enableAutosuggestions = true;
-    initExtra = ''
-      PROMPT='%F{%(!.red.green)}%n%f@%m %(?.%F{green}✓%f.%F{red}✗ ($?%))%f %F{blue}%~%f %F{magenta}$(git_prompt_info)%f$prompt_newline%_%F{%(!.red.green)}$(prompt_char)%f '
+    initExtra = let
+      inNixShell = ''$([[ -n "$IN_NIX_SHELL" ]] && printf " 🐚")'';
+    in ''
+      PROMPT='%F{%(!.red.green)}%n%f@%m %(?.%F{green}✓%f.%F{red}✗ ($?%))%f %F{blue}%~%f${inNixShell}%F{magenta}$(git_prompt_info)%f$prompt_newline%_%F{%(!.red.green)}$(prompt_char)%f '
       RPROMPT=""
 
       # Automatic rehash