diff --git a/av1/encoder/ratectrl.c b/av1/encoder/ratectrl.c
index 754da2b..490d9ef 100644
--- a/av1/encoder/ratectrl.c
+++ b/av1/encoder/ratectrl.c
@@ -155,7 +155,7 @@
 int av1_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
                        double correction_factor, aom_bit_depth_t bit_depth) {
   const double q = av1_convert_qindex_to_q(qindex, bit_depth);
-  int enumerator = frame_type == KEY_FRAME ? 2000000 : 1800000;
+  int enumerator = frame_type == KEY_FRAME ? 2000000 : 1440000;
 
   assert(correction_factor <= MAX_BPB_FACTOR &&
          correction_factor >= MIN_BPB_FACTOR);
diff --git a/test/datarate_test.cc b/test/datarate_test.cc
index d6c8c00..2f68121 100644
--- a/test/datarate_test.cc
+++ b/test/datarate_test.cc
@@ -279,9 +279,9 @@
 
     ResetModel();
     ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
-    ASSERT_GE(effective_datarate_, cfg_.rc_target_bitrate * 0.85)
+    ASSERT_GE(effective_datarate_, cfg_.rc_target_bitrate * 0.83)
         << " The datarate for the file is lower than target by too much!";
-    ASSERT_LE(effective_datarate_, cfg_.rc_target_bitrate * 1.16)
+    ASSERT_LE(effective_datarate_, cfg_.rc_target_bitrate * 1.17)
         << " The datarate for the file is greater than target by too much!";
   }
 };