1 files changed, 3 insertions, 0 deletions
diff --git a/src/encode.h b/src/encode.h
index 36cfcd4..cc5af20 100644
--- a/src/encode.h
+++ b/src/encode.h
@@ -120,6 +120,9 @@ struct internal_state {
      * depending on whether the block has a reference sample or not */
     int ref;
 
+    /* reference sample stored here for performance reasons */
+    uint32_t ref_sample;
+
     /* current zero block has a reference sample */
     int zero_ref;