diff --git a/vp9/common/vp9_entropy.c b/vp9/common/vp9_entropy.c
index c7733ad0425f9f68c4c92dd11001caacc7b39577..df3a9fed53bb8ed3f70e6d027a89af37a50a9f82 100644
--- a/vp9/common/vp9_entropy.c
+++ b/vp9/common/vp9_entropy.c
@@ -419,7 +419,7 @@ static void init_bit_trees() {
   init_bit_tree(cat6, 14);
 }
 
-vp9_extra_bit vp9_extra_bits[12] = {
+const vp9_extra_bit vp9_extra_bits[12] = {
   { 0, 0, 0, 0},
   { 0, 0, 0, 1},
   { 0, 0, 0, 2},
diff --git a/vp9/common/vp9_entropy.h b/vp9/common/vp9_entropy.h
index 9fa1fc60d906e6e1c8a6d01ee48b5dbf75a39d44..861c0786c80683f9d2f4495b09c8d096aa41f219 100644
--- a/vp9/common/vp9_entropy.h
+++ b/vp9/common/vp9_entropy.h
@@ -50,7 +50,7 @@ typedef struct {
   int base_val;
 } vp9_extra_bit;
 
-extern vp9_extra_bit vp9_extra_bits[12];    /* indexed by token value */
+extern const vp9_extra_bit vp9_extra_bits[12];    /* indexed by token value */
 
 #define MAX_PROB                255
 #define DCT_MAX_VALUE           16384
diff --git a/vp9/encoder/vp9_tokenize.c b/vp9/encoder/vp9_tokenize.c
index 27831aa22fdc90d553ff89045189aec4eb7a1431..0a42a32aea9f9c02d067e45f2591b0a44b5148fc 100644
--- a/vp9/encoder/vp9_tokenize.c
+++ b/vp9/encoder/vp9_tokenize.c
@@ -40,7 +40,7 @@ const int *vp9_dct_value_cost_ptr;
 static void fill_value_tokens() {
 
   TOKENVALUE *const t = dct_value_tokens + DCT_MAX_VALUE;
-  vp9_extra_bit *const e = vp9_extra_bits;
+  const vp9_extra_bit *const e = vp9_extra_bits;
 
   int i = -DCT_MAX_VALUE;
   int sign = 1;
@@ -69,7 +69,7 @@ static void fill_value_tokens() {
     // initialize the cost for extra bits for all possible coefficient value.
     {
       int cost = 0;
-      vp9_extra_bit *p = vp9_extra_bits + t[i].token;
+      const vp9_extra_bit *p = vp9_extra_bits + t[i].token;
 
       if (p->base_val) {
         const int extra = t[i].extra;