diff --git a/FirebaseCombineSwift/Tests/Unit/Firestore/GetDocumentsTests.swift b/FirebaseCombineSwift/Tests/Unit/Firestore/GetDocumentsTests.swift
index 0b1c539f5cb..a0eb8ea0a7b 100644
--- a/FirebaseCombineSwift/Tests/Unit/Firestore/GetDocumentsTests.swift
+++ b/FirebaseCombineSwift/Tests/Unit/Firestore/GetDocumentsTests.swift
@@ -20,7 +20,7 @@ import XCTest
 
 class GetDocumentsTests: XCTestCase {
   let expectationTimeout: TimeInterval = 2
-  class MockQuery: QueryFake {
+  class MockQuery: QueryFake, @unchecked Sendable {
     var mockGetDocuments: () throws -> QuerySnapshot = {
       fatalError("You need to implement \(#function) in your mock.")
     }