diff --git a/src/types/settings.ts b/src/types/settings.ts
index 57ef0951..6e0e2326 100644
--- a/src/types/settings.ts
+++ b/src/types/settings.ts
@@ -44,7 +44,7 @@ export type TomSettings = {
 	optgroupLabelField		: string,
 	optgroupValueField		: string,
 	lockOptgroupOrder		: boolean,
-	optionGroupRegister		: TomCreateCallback,
+	optionGroupRegister		: TomCreateOptgroup,
 
 	sortField				: string|SifterSort[]|SifterSortFn,
 	searchField				: string[],