diff --git a/aom_dsp/prob.h b/aom_dsp/prob.h
index a7fc544..9921623 100644
--- a/aom_dsp/prob.h
+++ b/aom_dsp/prob.h
@@ -139,8 +139,7 @@
     }                                                  \
   } while (0)
 
-void av1_indices_from_tree(int *ind, int *inv, int len,
-                           const aom_tree_index *tree);
+void av1_indices_from_tree(int *ind, int *inv, const aom_tree_index *tree);
 #endif
 
 DECLARE_ALIGNED(16, extern const uint8_t, aom_norm[256]);