diff --git a/cookbook/external_completers.md b/cookbook/external_completers.md
index 88fac6dc0ad..283ebcbf44f 100644
--- a/cookbook/external_completers.md
+++ b/cookbook/external_completers.md
@@ -148,7 +148,7 @@ let external_completer = {|spans|
         $spans
     }
 
-    match {
+    match $spans.0 {
         # carapace completions are incorrect for nu
         nu => $fish_completer
         # fish completes commits and branch names in a nicer way