diff --git a/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm b/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
index 597529f19c..553d5be84d 100644
--- a/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
+++ b/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
@@ -1938,7 +1938,9 @@ private:
 
     AudioProcessorParameter* getParameterForAUParameterID (AudioUnitParameterID address) const noexcept
     {
-        return paramMap[static_cast<int32> (address)];
+        auto index = static_cast<int32> (address);
+        return forceUseLegacyParamIDs ? juceParameters.getParamForIndex (index)
+                                      : paramMap[index];
     }
 
     //==============================================================================