diff --git a/docs/configuration/configuration.md b/docs/configuration/configuration.md
index b765b5a1..3c03d6c3 100644
--- a/docs/configuration/configuration.md
+++ b/docs/configuration/configuration.md
@@ -10,7 +10,7 @@ nav_order: 3
 
 `oauth2_proxy` can be configured via [config file](#config-file), [command line options](#command-line-options) or [environment variables](#environment-variables).
 
-To generate a strong cookie secret use `python -c 'import os,base64; print base64.urlsafe_b64encode(os.urandom(16))'`
+To generate a strong cookie secret use `python -c 'import os,base64; print(base64.urlsafe_b64encode(os.urandom(16)).decode())'`
 
 ### Config File