diff --git a/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp b/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp
index 47136c215d..c7527f2373 100644
--- a/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp
+++ b/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp
@@ -531,7 +531,7 @@ struct AttachedControlBase  : public AudioProcessorValueTreeState::Listener,
 
     AudioProcessorValueTreeState& state;
     String paramID;
-    float lastValue;
+    std::atomic<float> lastValue;
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AttachedControlBase)
 };