diff --git a/tools/internal_ci/macos/grpc_basictests_c_cpp.cfg b/tools/internal_ci/macos/grpc_basictests_c_cpp.cfg
index 9783dd64673..f16e3e8ee68 100644
--- a/tools/internal_ci/macos/grpc_basictests_c_cpp.cfg
+++ b/tools/internal_ci/macos/grpc_basictests_c_cpp.cfg
@@ -17,7 +17,7 @@
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/macos/grpc_run_tests_matrix.sh"
 gfile_resources: "/bigstore/grpc-testing-secrets/gcp_credentials/GrpcTesting-d0eeee2db331.json"
-timeout_mins: 60
+timeout_mins: 120
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"
diff --git a/tools/internal_ci/windows/grpc_basictests_c.cfg b/tools/internal_ci/windows/grpc_basictests_c.cfg
index 150a28e3f89..223cf389d0e 100644
--- a/tools/internal_ci/windows/grpc_basictests_c.cfg
+++ b/tools/internal_ci/windows/grpc_basictests_c.cfg
@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/windows/grpc_run_tests_matrix.bat"
-timeout_mins: 60
+timeout_mins: 120
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"