diff git a/libavcodec/acelp_pitch_delay.c b/libavcodec/acelp_pitch_delay.c
index a070d1b25d..5ab12ae14d 100644
 a/libavcodec/acelp_pitch_delay.c
+++ b/libavcodec/acelp_pitch_delay.c
@@ 56,20 +56,6 @@ int ff_acelp_decode_5_6_bit_to_2nd_delay3(
return 3 * pitch_delay_min + ac_index  2;
}
int ff_acelp_decode_9bit_to_1st_delay6(int ac_index)
{
 if(ac_index < 463)
 return ac_index + 105;
 else
 return 6 * (ac_index  368);
}
int ff_acelp_decode_6bit_to_2nd_delay6(
 int ac_index,
 int pitch_delay_min)
{
 return 6 * pitch_delay_min + ac_index  3;
}

void ff_acelp_update_past_gain(
int16_t* quant_energy,
int gain_corr_factor,
diff git a/libavcodec/acelp_pitch_delay.h b/libavcodec/acelp_pitch_delay.h
index 2aade2f226..973cb0caa0 100644
 a/libavcodec/acelp_pitch_delay.h
+++ b/libavcodec/acelp_pitch_delay.h
@@ 82,39 +82,6 @@ int ff_acelp_decode_4bit_to_2nd_delay3(
int ac_index,
int pitch_delay_min);
/**
 * @brief Decode pitch delay of the first subframe encoded by 9 bits
 * with 1/6 precision.
 * @param ac_index adaptive codebook index (9 bits)
 *
 * @return pitch delay in 1/6 units
 *
 * Pitch delay is coded:
 * with 1/6 resolution, 17 < pitch_delay < 95
 * integers only, 95 <= pitch_delay <= 143
 *
 * @remark The routine is used in AMR @@12.2k for the first and third subframes.
 */
int ff_acelp_decode_9bit_to_1st_delay6(int ac_index);

/**
 * @brief Decode pitch delay of the second subframe encoded by 6 bits
 * with 1/6 precision.
 * @param ac_index adaptive codebook index (6 bits)
 * @param pitch_delay_min lower bound (integer) of pitch delay interval for
 * second subframe
 *
 * @return pitch delay in 1/6 units
 *
 * Pitch delay is coded:
 * with 1/6 resolution, 6 < pitch_delay  int(prev_pitch_delay) < 5
 *
 * @remark The routine is used in AMR @@12.2k for the second and fourth subframes.
 */
int ff_acelp_decode_6bit_to_2nd_delay6(
 int ac_index,
 int pitch_delay_min);

/**
* @brief Update past quantized energies
* @param[in,out] quant_energy past quantized energies (5.10)