diff --git a/@commitlint/types/src/prompt.ts b/@commitlint/types/src/prompt.ts
index d81b5f0648..d9eda48f05 100644
--- a/@commitlint/types/src/prompt.ts
+++ b/@commitlint/types/src/prompt.ts
@@ -42,6 +42,7 @@ export type PromptMessages = {
 	emptyWarning?: string;
 	upperLimitWarning?: string;
 	lowerLimitWarning?: string;
+	[_key: string]: string | undefined;
 };
 
 export type UserPromptConfig = DeepPartial<PromptConfig>;