diff --git a/lib/asdf.fish b/lib/asdf.fish
index 698b5444f..d14ab3897 100644
--- a/lib/asdf.fish
+++ b/lib/asdf.fish
@@ -7,7 +7,7 @@ function asdf
     switch "$command"
         case "shell"
             # source commands that need to export variables
-            . (asdf export-shell-version fish $argv | psub)
+            command asdf export-shell-version fish $argv | source # asdf_allow: source
         case '*'
             # forward other commands to asdf script
             command asdf "$command" $argv
diff --git a/test/banned_commands.bats b/test/banned_commands.bats
index 40d5e0e6c..1202f1419 100644
--- a/test/banned_commands.bats
+++ b/test/banned_commands.bats
@@ -26,6 +26,7 @@ banned_commands=(
     "sort.*-V"
     "sort.*--sort-versions"
     # source isn't POSIX compliant. . behaves the same and is POSIX compliant
+    # Except in fish, where . is deprecated, and will be removed in the future.
     source
 )