diff --git a/lib_com/options.h b/lib_com/options.h
index 889d42845bc7d1c0dfeccddd0d570658921a9210..e91c112ac03412e890971135d74ae82c0f90fa5d 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -104,6 +104,9 @@
 
 #define FIX_1962_FORMAT_CONV_SPECTRAL_DIFF                   /* FhG: Improved precision of targetEnergy in ivas_ls_setup_conversion_process_mdct_fx() */
 #define FIX_2003_CON_TCX_OVERFLOW                            /* FhG: Use a dynamic scaling factor for the synth buffer at the output of con_tcx_ivas_fx() */
+
+#define FIX_2048_DELTA_MASKING_NOISE_Q15                     /* Dolby: Change the threshold for masking noise from 0 to 1 (1e-20f) to maintain consistency with the FLOAT code */
+
 /* #################### Start BASOP porting switches ############################ */
 
 #define NONBE_1244_FIX_SWB_BWE_MEMORY                   /* VA: issue 1244: fix to SWB BWE memory in case of switching from FB coding - pending a review by Huawei */
diff --git a/lib_dec/fd_cng_dec_fx.c b/lib_dec/fd_cng_dec_fx.c
index d3b9634522e9c7e7ed83c4c2a6784a0ac57c2ca7..5493d2a1c60027ba7b5e15938a81aea3237aa0a3 100644
--- a/lib_dec/fd_cng_dec_fx.c
+++ b/lib_dec/fd_cng_dec_fx.c
@@ -20,11 +20,15 @@
 #endif
 
 
-#define CNA_ACT_DN_LARGE_PARTITION   50    /* index of the first larger partition */
-#define ST_PERIODOG_FACT_Q15         29491 /* 0.9 in Q15, short-term filter factor for periodogram */
-#define CNA_ACT_DN_FACT_Q15          22938 /* 0.7 in Q15, downward updating factor for CNA during active frames */
-#define FIRST_CNA_NOISE_UPD_FRAMES   5     /* minimum number of CN initialization frames */
-#define DELTA_MASKING_NOISE_Q15      0
+#define CNA_ACT_DN_LARGE_PARTITION 50    /* index of the first larger partition */
+#define ST_PERIODOG_FACT_Q15       29491 /* 0.9 in Q15, short-term filter factor for periodogram */
+#define CNA_ACT_DN_FACT_Q15        22938 /* 0.7 in Q15, downward updating factor for CNA during active frames */
+#define FIRST_CNA_NOISE_UPD_FRAMES 5     /* minimum number of CN initialization frames */
+#ifdef FIX_2048_DELTA_MASKING_NOISE_Q15
+#define DELTA_MASKING_NOISE_Q15 1
+#else
+#define DELTA_MASKING_NOISE_Q15 0
+#endif
 #define LOG_10_BASE_2                1783446566 /* Q29 */
 #define GAIN_Q_OFFSET_IVAS_FX        45
 #define LOG_10_BASE_2_BY_10_Q31      713378606