diff --git a/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h b/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
index bfed95b273..1a56fcf226 100644
--- a/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
+++ b/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
@@ -23,6 +23,8 @@
   ==============================================================================
 */
 
+#ifndef DOXYGEN
+
 // Forward declarations to avoid leaking implementation details.
 namespace Steinberg
 {
@@ -30,7 +32,9 @@ namespace Steinberg
     {
         class IComponent;
     }
-}
+} // namespace Steinberg
+
+#endif
 
 //==============================================================================
 #if (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || (defined(AUDIOCOMPONENT_NOCARBONINSTANCES) && AUDIOCOMPONENT_NOCARBONINSTANCES)
diff --git a/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h b/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h
index ffbf0056dc..bb232b9a40 100644
--- a/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h
+++ b/modules/juce_audio_processors/utilities/juce_VST3ClientExtensions.h
@@ -23,12 +23,16 @@
   ==============================================================================
 */
 
+#ifndef DOXYGEN
+
 // Forward declaration to avoid leaking implementation details.
 namespace Steinberg
 {
     class FUnknown;
     using TUID = char[16];
-}
+} // namespace Steinberg
+
+#endif
 
 namespace juce
 {