diff --git a/modules/congestion_controller/goog_cc/probe_controller_unittest.cc b/modules/congestion_controller/goog_cc/probe_controller_unittest.cc
index 2fa1e22a2c..04dc4407fb 100644
--- a/modules/congestion_controller/goog_cc/probe_controller_unittest.cc
+++ b/modules/congestion_controller/goog_cc/probe_controller_unittest.cc
@@ -313,7 +313,7 @@ TEST_F(ProbeControllerTest, TestAllocatedBitrateCap) {
 }
 
 TEST_F(ProbeControllerTest, ConfigurableProbingFieldTrial) {
-  auto trials = test::ScopedFieldTrials(
+  test::ScopedFieldTrials trials(
       "WebRTC-Bwe-ConfigurableProbing/"
       "p1:2,p2:5,step_size:3,further_probe_threshold:0.8/");
   probe_controller_.reset(
diff --git a/rtc_base/fake_clock.h b/rtc_base/fake_clock.h
index 5ccf370b42..f5539f7e1b 100644
--- a/rtc_base/fake_clock.h
+++ b/rtc_base/fake_clock.h
@@ -54,6 +54,8 @@ class FakeClock : public ClockInterface {
 class ScopedFakeClock : public FakeClock {
  public:
   ScopedFakeClock();
+  ScopedFakeClock(const ScopedFakeClock&) = delete;
+  ScopedFakeClock& operator=(const ScopedFakeClock&) = delete;
   ~ScopedFakeClock() override;
 
  private:
diff --git a/rtc_base/synchronization/yield_policy.h b/rtc_base/synchronization/yield_policy.h
index 8146930666..5def6b7397 100644
--- a/rtc_base/synchronization/yield_policy.h
+++ b/rtc_base/synchronization/yield_policy.h
@@ -22,6 +22,8 @@ class YieldInterface {
 class ScopedYieldPolicy final {
  public:
   explicit ScopedYieldPolicy(YieldInterface* policy);
+  ScopedYieldPolicy(const ScopedYieldPolicy&) = delete;
+  ScopedYieldPolicy& operator=(const ScopedYieldPolicy&) = delete;
   ~ScopedYieldPolicy();
   // Will yield as specified by the currently active thread-local yield policy
   // (which by default is a no-op).
diff --git a/rtc_base/thread.h b/rtc_base/thread.h
index 7bb7a3c130..80720e0794 100644
--- a/rtc_base/thread.h
+++ b/rtc_base/thread.h
@@ -160,6 +160,9 @@ class RTC_LOCKABLE Thread : public MessageQueue {
   class ScopedDisallowBlockingCalls {
    public:
     ScopedDisallowBlockingCalls();
+    ScopedDisallowBlockingCalls(const ScopedDisallowBlockingCalls&) = delete;
+    ScopedDisallowBlockingCalls& operator=(const ScopedDisallowBlockingCalls&) =
+        delete;
     ~ScopedDisallowBlockingCalls();
 
    private:
diff --git a/test/field_trial.h b/test/field_trial.h
index 2d8f37561a..a500142e8e 100644
--- a/test/field_trial.h
+++ b/test/field_trial.h
@@ -37,6 +37,8 @@ void ValidateFieldTrialsStringOrDie(const std::string& config);
 class ScopedFieldTrials {
  public:
   explicit ScopedFieldTrials(const std::string& config);
+  ScopedFieldTrials(const ScopedFieldTrials&) = delete;
+  ScopedFieldTrials& operator=(const ScopedFieldTrials&) = delete;
   ~ScopedFieldTrials();
 
  private: