diff --git a/modules/juce_audio_processors/format_types/juce_VST3Headers.h b/modules/juce_audio_processors/format_types/juce_VST3Headers.h
index 50b8552f42..a489bcb239 100644
--- a/modules/juce_audio_processors/format_types/juce_VST3Headers.h
+++ b/modules/juce_audio_processors/format_types/juce_VST3Headers.h
@@ -110,7 +110,6 @@ namespace Steinberg
     DEF_CLASS_IID (IPlugView)
     DEF_CLASS_IID (IPlugFrame)
     DEF_CLASS_IID (IBStream)
-    DEF_CLASS_IID (ISizeableStream)
     DEF_CLASS_IID (IPluginFactory)
     DEF_CLASS_IID (IPluginFactory2)
     DEF_CLASS_IID (IPluginFactory3)