diff --git a/lib_com/ivas_fb_mixer.c b/lib_com/ivas_fb_mixer.c
index a2f1a9d509f92b3da666862a600742d285bd9f13..80247804b0d84b0ce12032de7faecf59845f8bff 100644
--- a/lib_com/ivas_fb_mixer.c
+++ b/lib_com/ivas_fb_mixer.c
@@ -49,7 +49,9 @@
 
 static void ivas_get_active_bins( const int16_t **pActive_bins, const int16_t **pActive_bins_abs, const int16_t **pStart_offset, const int16_t **pStart_offset_ab, const int32_t sampling_rate );
 static void ivas_get_ld_fb_resp( float **ppIdeal_FRs_re, float **ppIdeal_FRs_im, float **ppNew_FRs_re, float **ppNew_FRs_im, const int16_t *pActive_bins, const int16_t *pStart_offset, const int16_t num_bands, const int16_t delay, const int32_t sampling_rate );
+#ifndef FIX_383_CLEAN_UP
 static int16_t ivas_fb_mixer_get_band_diff_non48k( const int32_t sampling_rate, const float delay_ms );
+#endif
 static const float *ivas_get_cheby_ramp( const int16_t delay );
 static void ivas_get_hanning_win( const int16_t len, float *pH_win );
 static ivas_error ivas_filterbank_setup( IVAS_FB_MIXER_HANDLE hFbMixer, const int32_t sampling_rate );
diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100755
new mode 100644
index aafa43e9af5b6de1ea997816ba41fae928c6feec..b732ef66884b48079da3fbdce6b0595425504ca5
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -179,13 +179,10 @@
 #define FIX_541_EXT_REND_MASA_ROTATIONS                 /* Nokia: Issue 541, rotations missing in masa external renderer */
 
 #define MASA_PREREND                                    /* Nokia: Contribution 42: Support for IVAS_rend to merge MASA + other format to MASA */
+#define FIX_383_CLEAN_UP                                /* Dlb : Clean up of unused functions */
 #define ISM_25k6_HZ_CORE                                /* VA: issue 540: 1ISM 48 kbps - change ACELP/TCX 16 kHz core to TCX only 25.6 kHz core */
-
-
-
 #define FIX_528_ISM_MD_FILE_TOO_SHORT                   /* VA: issue 528: ISM Metadata file too short  */
 
-
 /* ################## End DEVELOPMENT switches ######################### */
 /* clang-format on */
 
diff --git a/lib_enc/ivas_spar_md_enc.c b/lib_enc/ivas_spar_md_enc.c
index 99134b2af3b2f4db0c637f7590fd1340dfefd24c..dbca3809ccfc5988867a0ae38ccda187a4ec880b 100644
--- a/lib_enc/ivas_spar_md_enc.c
+++ b/lib_enc/ivas_spar_md_enc.c
@@ -69,7 +69,9 @@ typedef enum ivas_strats_t
 
 static void ivas_band_mixer( float *cov_re[IVAS_SPAR_MAX_CH][IVAS_SPAR_MAX_CH], const int16_t num_ch, int16_t *num_bands, int16_t red_band_fact );
 
+#ifndef FIX_383_CLEAN_UP
 static void ivas_get_band_differential_index( ivas_band_coeffs_ind_t *pBand_idx, const int16_t q_levels[2], const int16_t one_sided, const int16_t nB, const int16_t complex_cov, const int16_t dim, const ivas_coeffs_type_t coeff_type );
+#endif
 
 static int16_t ivas_get_huffman_coded_bs( ivas_spar_md_enc_state_t *hMdEnc, BSTR_ENC_HANDLE hMetaData, const int16_t nB, const int16_t qsi, const int16_t planarCP, const int16_t bands_bw );
 static int16_t ivas_get_arith_coded_bs( ivas_spar_md_enc_state_t *hMdEnc, BSTR_ENC_HANDLE hMetaData, const int16_t *pDo_diff, const int16_t bands_bw, const int16_t nB, const int16_t qsi, const int16_t planarCP, const int16_t strat, const int32_t ivas_total_brate );