diff --git a/aom_dsp/bitwriter_buffer.c b/aom_dsp/bitwriter_buffer.c
index 9d6a0da..c341ca3 100644
--- a/aom_dsp/bitwriter_buffer.c
+++ b/aom_dsp/bitwriter_buffer.c
@@ -24,6 +24,7 @@
   const int p = off / CHAR_BIT;
   const int q = CHAR_BIT - 1 - off % CHAR_BIT;
   if (q == CHAR_BIT - 1) {
+    // Zero next char and write bit
     wb->bit_buffer[p] = bit << q;
   } else {
     wb->bit_buffer[p] &= ~(1 << q);
@@ -32,11 +33,28 @@
   wb->bit_offset = off + 1;
 }
 
+void aom_wb_overwrite_bit(struct aom_write_bit_buffer *wb, int bit) {
+  // Do not zero bytes but overwrite exisiting values
+  const int off = (int)wb->bit_offset;
+  const int p = off / CHAR_BIT;
+  const int q = CHAR_BIT - 1 - off % CHAR_BIT;
+  wb->bit_buffer[p] &= ~(1 << q);
+  wb->bit_buffer[p] |= bit << q;
+  wb->bit_offset = off + 1;
+}
+
 void aom_wb_write_literal(struct aom_write_bit_buffer *wb, int data, int bits) {
   int bit;
   for (bit = bits - 1; bit >= 0; bit--) aom_wb_write_bit(wb, (data >> bit) & 1);
 }
 
+void aom_wb_overwrite_literal(struct aom_write_bit_buffer *wb, int data,
+                              int bits) {
+  int bit;
+  for (bit = bits - 1; bit >= 0; bit--)
+    aom_wb_overwrite_bit(wb, (data >> bit) & 1);
+}
+
 void aom_wb_write_inv_signed_literal(struct aom_write_bit_buffer *wb, int data,
                                      int bits) {
   aom_wb_write_literal(wb, data, bits + 1);
diff --git a/aom_dsp/bitwriter_buffer.h b/aom_dsp/bitwriter_buffer.h
index 63027ef..8160765 100644
--- a/aom_dsp/bitwriter_buffer.h
+++ b/aom_dsp/bitwriter_buffer.h
@@ -27,8 +27,13 @@
 
 void aom_wb_write_bit(struct aom_write_bit_buffer *wb, int bit);
 
+void aom_wb_overwrite_bit(struct aom_write_bit_buffer *wb, int bit);
+
 void aom_wb_write_literal(struct aom_write_bit_buffer *wb, int data, int bits);
 
+void aom_wb_overwrite_literal(struct aom_write_bit_buffer *wb, int data,
+                              int bits);
+
 void aom_wb_write_inv_signed_literal(struct aom_write_bit_buffer *wb, int data,
                                      int bits);