diff --git a/src/JSONEditor.svelte b/src/JSONEditor.svelte
index 730bd30..0ad937a 100644
--- a/src/JSONEditor.svelte
+++ b/src/JSONEditor.svelte
@@ -59,7 +59,7 @@
     state = syncState(doc, state, [], callback, true)
   }
 
-  export function collapse (doCollapse = () => false) {
+  export function collapse (callback = () => false) {
     state = syncState(doc, state, [], callback, true)
   }