diff --git a/tgcalls/group/GroupInstanceCustomImpl.cpp b/tgcalls/group/GroupInstanceCustomImpl.cpp
index 85056e14..61b2fcdc 100644
--- a/tgcalls/group/GroupInstanceCustomImpl.cpp
+++ b/tgcalls/group/GroupInstanceCustomImpl.cpp
@@ -829,6 +829,8 @@ class AudioCapturePostProcessor : public webrtc::CustomProcessing {
     std::vector<float> *_externalAudioSamples = nullptr;
     webrtc::Mutex *_externalAudioSamplesMutex = nullptr;
 };
+#else
+class AudioCapturePostProcessor : public webrtc::CustomProcessing {};
 #endif
 
 class ExternalAudioRecorder : public FakeAudioDeviceModule::Recorder {