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-rw-r--r--src/emu/ioport.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/emu/ioport.h b/src/emu/ioport.h
index fdf859b9afd..53e1e9ad5e8 100644
--- a/src/emu/ioport.h
+++ b/src/emu/ioport.h
@@ -357,6 +357,7 @@ enum ioport_type
IPT_UI_CLEAR,
IPT_UI_ZOOM_IN,
IPT_UI_ZOOM_OUT,
+ IPT_UI_ZOOM_AUTO,
IPT_UI_PREV_GROUP,
IPT_UI_NEXT_GROUP,
IPT_UI_ROTATE,