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 7c8d51d3ea..9523cdc3fc 100644
--- a/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
+++ b/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
@@ -1578,6 +1578,10 @@ private:
             {
                 const AudioUnitParameterID auParamID = generateAUParameterIDForIndex (i);
 
+                // Consider yourself very unlucky if you hit this assertion. The hash code of your
+                // parameter ids are not unique.
+                jassert (! paramMap.contains (static_cast<int32> (auParamID)));
+
                 auParamIDs.add (auParamID);
                 paramMap.set (static_cast<int32> (auParamID), i);
 
diff --git a/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm b/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
index baa55f7624..09e5da016d 100644
--- a/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
+++ b/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
@@ -845,6 +845,11 @@ private:
             AUParameterAddress address = static_cast<AUParameterAddress> (idx);
            #else
             AUParameterAddress address = generateAUParameterAddressForIndex (idx);
+
+            // Consider yourself very unlucky if you hit this assertion. The hash code of your
+            // parameter ids are not unique.
+            jassert (! paramMap.contains (static_cast<int64> (address)));
+
             paramAddresses.add (address);
             paramMap.set (static_cast<int64> (address), idx);
           #endif
diff --git a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
index 794f791a38..5bbf38adf4 100644
--- a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
@@ -2093,6 +2093,10 @@ private:
         {
             const Vst::ParamID paramID = JuceVST3EditController::generateVSTParamIDForIndex (pluginInstance, i);
 
+            // Consider yourself very unlucky if you hit this assertion. The hash code of your
+            // parameter ids are not unique.
+            jassert (! vstParamIDs.contains (static_cast<int32> (paramID)));
+
             vstParamIDs.add (paramID);
             paramMap.set (static_cast<int32> (paramID), i);
         }