diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
index 4c87d42ff7..5afcccd6a8 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
@@ -1405,7 +1405,7 @@ bool AudioProcessorGraph::Connection::operator< (const Connection& other) const
 }
 
 //==============================================================================
-class AudioProcessorGraph::Pimpl : private AsyncUpdater
+class AudioProcessorGraph::Pimpl : public AsyncUpdater
 {
 public:
     explicit Pimpl (AudioProcessorGraph& o) : owner (&o) {}
diff --git a/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp b/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp
index ad90849480..d153c3d289 100644
--- a/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp
+++ b/modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp
@@ -102,6 +102,8 @@ class ParameterComponent : public Component,
 {
 public:
     using ParameterListener::ParameterListener;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ParameterComponent)
 };
 
 //==============================================================================
diff --git a/modules/juce_core/threads/juce_HighResolutionTimer.cpp b/modules/juce_core/threads/juce_HighResolutionTimer.cpp
index 002ebf7612..28ca899d96 100644
--- a/modules/juce_core/threads/juce_HighResolutionTimer.cpp
+++ b/modules/juce_core/threads/juce_HighResolutionTimer.cpp
@@ -23,7 +23,7 @@
 namespace juce
 {
 
-class HighResolutionTimer::Pimpl : private Thread
+class HighResolutionTimer::Pimpl : public Thread
 {
     using steady_clock = std::chrono::steady_clock;
     using milliseconds = std::chrono::milliseconds;