diff --git a/vp9/common/vp9_entropymode.h b/vp9/common/vp9_entropymode.h
index a71585a92c2e70fb50a2d7f5c0c57d6e9e18a500..1094e82b12c3ee5798d32f5ee95b92f34f096bb7 100644
--- a/vp9/common/vp9_entropymode.h
+++ b/vp9/common/vp9_entropymode.h
@@ -69,7 +69,9 @@ void vp9_init_mbmode_probs(struct VP9Common *x);
 
 void vp9_adapt_mode_probs(struct VP9Common *);
 
-void vp9_accum_mv_refs(struct VP9Common *pc, MB_PREDICTION_MODE m, int context);
+void vp9_accum_mv_refs(struct VP9Common *pc,
+                       MB_PREDICTION_MODE m,
+                       const int context);
 
 void tx_counts_to_branch_counts_32x32(unsigned int *tx_count_32x32p,
                                       unsigned int (*ct_32x32p)[2]);