diff --git a/doc/languages-frameworks/python.md b/doc/languages-frameworks/python.md
index 7bdbbbd903a..0ff7c4ba77e 100644
--- a/doc/languages-frameworks/python.md
+++ b/doc/languages-frameworks/python.md
@@ -165,7 +165,7 @@ run the script in the `python3` shell.
 
 ```py
 #! /usr/bin/env nix-shell
-#! nix-shell -i 'python3.withPackages(ps: [ps.numpy])'
+#! nix-shell -i python3 -p 'python3.withPackages(ps: [ps.numpy])'
 
 import numpy