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-rw-r--r--src/emu/emufwd.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/emu/emufwd.h b/src/emu/emufwd.h
index 89e15e4c541..cf14dcb8163 100644
--- a/src/emu/emufwd.h
+++ b/src/emu/emufwd.h
@@ -235,7 +235,9 @@ class sound_manager;
class sound_stream;
// declared in speaker.h
+class sound_io_device;
class speaker_device;
+class microphone_device;
// declared in tilemap.h
class tilemap_device;