diff --git a/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h b/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h
index 1fa7d37384..76195c842c 100644
--- a/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h
+++ b/modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h
@@ -470,6 +470,8 @@ public:
         }
         else
         {
+            isClear = false;
+
             for (int chan = 0; chan < numChannels; ++chan)
             {
                 Type* const dest = channels[chan];