diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index 5e19698d07..308b115b89 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -141,6 +141,14 @@ struct AVFilterPad {
      * input pads only.
      */
     int needs_fifo;
+
+    /**
+     * The filter expects writable frames from its input link,
+     * duplicating data buffers if needed.
+     *
+     * input pads only.
+     */
+    int needs_writable;
 };
 #endif