diff --git a/vp8/encoder/encodeframe.c b/vp8/encoder/encodeframe.c
index 892284ed2cb5e5d20117b44c546e295cba32ad72..132e508580176e42ab47fc40eae6006472b18b6f 100644
--- a/vp8/encoder/encodeframe.c
+++ b/vp8/encoder/encodeframe.c
@@ -335,7 +335,8 @@ void vp8_activity_masking(VP8_COMP *cpi, MACROBLOCK *x)
 {
 #if USE_ACT_INDEX
     x->rdmult += *(x->mb_activity_ptr) * (x->rdmult >> 2);
-    x->errorperbit = x->rdmult/x->rddiv;
+    x->errorperbit = x->rdmult * 100 /(110 * x->rddiv);
+    x->errorperbit += (x->errorperbit==0);
 #else
     INT64 a;
     INT64 b;
@@ -346,8 +347,8 @@ void vp8_activity_masking(VP8_COMP *cpi, MACROBLOCK *x)
     b = (2*act) + cpi->activity_avg;
 
     x->rdmult = (unsigned int)(((INT64)x->rdmult*b + (a>>1))/a);
-    x->errorperbit = x->rdmult/x->rddiv;
-
+    x->errorperbit = x->rdmult * 100 /(110 * x->rddiv);
+    x->errorperbit += (x->errorperbit==0);
 #endif
 
     // Activity based Zbin adjustment
diff --git a/vp8/encoder/rdopt.c b/vp8/encoder/rdopt.c
index 5ce61a04e22f224ba66ff30998a2d5683277f656..e05ffdb1a757b046010506063d78f9300f9dc2ba 100644
--- a/vp8/encoder/rdopt.c
+++ b/vp8/encoder/rdopt.c
@@ -238,7 +238,7 @@ void vp8_initialize_rd_consts(VP8_COMP *cpi, int Qvalue)
                 (cpi->RDMULT * rd_iifactor[cpi->twopass.next_iiratio]) >> 4;
     }
 
-    cpi->mb.errorperbit = (cpi->RDMULT / 100);
+    cpi->mb.errorperbit = (cpi->RDMULT / 110);
     cpi->mb.errorperbit += (cpi->mb.errorperbit==0);
 
     vp8_set_speed_features(cpi);