diff --git a/docs/docsite/rst/installation_guide/intro_installation.rst b/docs/docsite/rst/installation_guide/intro_installation.rst
index 3bbb93f98a4..38e46f00a60 100644
--- a/docs/docsite/rst/installation_guide/intro_installation.rst
+++ b/docs/docsite/rst/installation_guide/intro_installation.rst
@@ -330,7 +330,7 @@ Using Bash:
 
 Using Fish::
 
-    $ . ./hacking/env-setup.fish
+    $ source ./hacking/env-setup.fish
 
 If you want to suppress spurious warnings/errors, use::