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-rw-r--r--macosx/HBAudioTrackPreset.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/macosx/HBAudioTrackPreset.h b/macosx/HBAudioTrackPreset.h
index f8f09ea14..0c96a3af8 100644
--- a/macosx/HBAudioTrackPreset.h
+++ b/macosx/HBAudioTrackPreset.h
@@ -37,6 +37,8 @@ NS_ASSUME_NONNULL_BEGIN
@property (nonatomic, readonly) NSArray *samplerates;
@property (nonatomic, readonly) NSArray *bitrates;
+@property (nonatomic, readwrite, weak, nullable) NSUndoManager *undo;
+
@end
NS_ASSUME_NONNULL_END