diff --git a/test/cpp/end2end/BUILD b/test/cpp/end2end/BUILD
index d945dd3f7f7..998ba8e1e4e 100644
--- a/test/cpp/end2end/BUILD
+++ b/test/cpp/end2end/BUILD
@@ -637,6 +637,7 @@ grpc_cc_test(
 
 grpc_cc_test(
     name = "thread_stress_test",
+    timeout = "long",
     srcs = ["thread_stress_test.cc"],
     external_deps = [
         "gtest",