diff --git a/packages/experimental-utils/src/ts-eslint/RuleTester.ts b/packages/experimental-utils/src/ts-eslint/RuleTester.ts
index 4478abca8dd..bfaa9a45334 100644
--- a/packages/experimental-utils/src/ts-eslint/RuleTester.ts
+++ b/packages/experimental-utils/src/ts-eslint/RuleTester.ts
@@ -37,15 +37,6 @@ interface TestCaseError<TMessageIds extends string> {
   endColumn?: number;
 }
 
-interface RunTests<
-  TMessageIds extends string,
-  TOptions extends Readonly<any[]>
-> {
-  // RuleTester.run also accepts strings for valid cases
-  valid: (ValidTestCase<TOptions> | string)[];
-  invalid: InvalidTestCase<TMessageIds, TOptions>[];
-}
-
 interface RunTests<
   TMessageIds extends string,
   TOptions extends Readonly<any[]>