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-rw-r--r--libhb/internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libhb/internal.h b/libhb/internal.h
index ab444ace8..e66783bb4 100644
--- a/libhb/internal.h
+++ b/libhb/internal.h
@@ -452,6 +452,7 @@ extern hb_filter_object_t hb_filter_denoise;
extern hb_filter_object_t hb_filter_nlmeans;
extern hb_filter_object_t hb_filter_decomb;
extern hb_filter_object_t hb_filter_rotate;
+extern hb_filter_object_t hb_filter_grayscale;
extern hb_filter_object_t hb_filter_crop_scale;
extern hb_filter_object_t hb_filter_render_sub;
extern hb_filter_object_t hb_filter_vfr;