diff --git a/doc/manual/source/command-ref/nix-shell.md b/doc/manual/source/command-ref/nix-shell.md
index e95db9bea..03585fa2d 100644
--- a/doc/manual/source/command-ref/nix-shell.md
+++ b/doc/manual/source/command-ref/nix-shell.md
@@ -316,7 +316,7 @@ contains:
 ```nix
 with import <nixpkgs> {};
 
-runCommand "dummy" { buildInputs = [ python pythonPackages.prettytable ]; } ""
+runCommand "dummy" { buildInputs = [ python3 python3Packages.prettytable ]; } ""
 ```
 
 The script's file name is passed as the first argument to the interpreter specified by the `-i` flag.