diff --git a/distrho/src/DistrhoPluginAU.cpp b/distrho/src/DistrhoPluginAU.cpp
index d7ef546c..863a4744 100644
--- a/distrho/src/DistrhoPluginAU.cpp
+++ b/distrho/src/DistrhoPluginAU.cpp
@@ -724,7 +724,7 @@ public:
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inScope == kAudioUnitScope_Global, inScope, kAudioUnitErr_InvalidScope);
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inElement == 0, inElement, kAudioUnitErr_InvalidElement);
             outDataSize = sizeof(uint16_t);
-            outWritable = false;
+            outWritable = true;
             return noErr;
 
         case 'DPFe':
@@ -755,7 +755,7 @@ public:
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inScope == kAudioUnitScope_Global, inScope, kAudioUnitErr_InvalidScope);
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inElement == 0, inElement, kAudioUnitErr_InvalidElement);
             outDataSize = sizeof(uint32_t);
-            outWritable = false;
+            outWritable = true;
             return noErr;
        #endif
 
@@ -764,7 +764,7 @@ public:
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inScope == kAudioUnitScope_Global, inScope, kAudioUnitErr_InvalidScope);
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inElement == 0, inElement, kAudioUnitErr_InvalidElement);
             outDataSize = sizeof(CFArrayRef);
-            outWritable = false;
+            outWritable = true;
             return noErr;
 
         case 'DPFs':
@@ -780,7 +780,7 @@ public:
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inScope == kAudioUnitScope_Global, inScope, kAudioUnitErr_InvalidScope);
             DISTRHO_SAFE_ASSERT_UINT_RETURN(inElement == 0, inElement, kAudioUnitErr_InvalidElement);
             outDataSize = sizeof(void*);
-            outWritable = false;
+            outWritable = true;
             return noErr;
        #endif