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 6e1edbf437..d4592ab56d 100644
--- a/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
+++ b/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm
@@ -343,11 +343,14 @@ public:
                     {
                         if (juceFilter != nullptr)
                         {
+                            const String text (String::fromCFString (pv->inString));
+
                             if (AudioProcessorParameter* param = juceFilter->getParameters() [(int) pv->inParamID])
-                            {
-                                pv->outValue = param->getValueForText (String::fromCFString (pv->inString));
-                                return noErr;
-                            }
+                                pv->outValue = param->getValueForText (text);
+                            else
+                                pv->outValue = text.getFloatValue();
+
+                            return noErr;
                         }
                     }
                 }
@@ -359,11 +362,16 @@ public:
                     {
                         if (juceFilter != nullptr)
                         {
+                            const float value = (float) *(pv->inValue);
+                            String text;
+
                             if (AudioProcessorParameter* param = juceFilter->getParameters() [(int) pv->inParamID])
-                            {
-                                pv->outString = param->getText ((float) *(pv->inValue), 0).toCFString();
-                                return noErr;
-                            }
+                                text = param->getText ((float) *(pv->inValue), 0);
+                            else
+                                text = String (value);
+
+                            pv->outString = text.toCFString();
+                            return noErr;
                         }
                     }
                 }