diff --git a/src/encode_coding_tree.h b/src/encode_coding_tree.h
index 7410a073..5b4ce324 100644
--- a/src/encode_coding_tree.h
+++ b/src/encode_coding_tree.h
@@ -117,4 +117,7 @@ void uvg_encode_last_significant_xy(cabac_data_t * const cabac,
   uint8_t width, uint8_t height,
   uint8_t type, uint8_t scan, double* bits_out);
 
-void uvg_get_sub_coeff(coeff_t* dst, const coeff_t* const src, const int lcu_x, const int lcu_y, const int block_w, const int block_h);
+void uvg_get_sub_coeff(coeff_t* dst, const coeff_t* const src, 
+                       const int lcu_x, const int lcu_y, 
+                       const int block_w, const int block_h, 
+                       const int lcu_width);