diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
index 44f538a55b..1192c64f43 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
@@ -1246,7 +1246,7 @@ void AudioProcessorGraph::prepareToPlay (double sampleRate, int estimatedSamples
     setRateAndBufferSizeDetails (sampleRate, estimatedSamplesPerBlock);
     clearRenderingSequence();
 
-    if (MessageManager::getInstance()->isThisTheMessageThread())
+    if (isNonRealtime() && MessageManager::getInstance()->isThisTheMessageThread())
         handleAsyncUpdate();
     else
         triggerAsyncUpdate();