diff --git a/packages/typescript-estree/src/create-program/useProvidedPrograms.ts b/packages/typescript-estree/src/create-program/useProvidedPrograms.ts
index dd12f17461a..23b56497dc6 100644
--- a/packages/typescript-estree/src/create-program/useProvidedPrograms.ts
+++ b/packages/typescript-estree/src/create-program/useProvidedPrograms.ts
@@ -12,7 +12,7 @@ import {
 const log = debug('typescript-eslint:typescript-estree:useProvidedProgram');
 
 function useProvidedPrograms(
-  programInstances: ts.Program[] | Iterable<ts.Program>,
+  programInstances: Iterable<ts.Program>,
   extra: Extra,
 ): ASTAndProgram | undefined {
   log(