diff --git a/lib_com/options.h b/lib_com/options.h
index 865e54b2f78761e39ad06e06d7335e3ca30d8684..e6eeefe4f40f8153471ab4acd2814404dd02682b 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -157,6 +157,10 @@
 // #define FIX_966_VAR_OVERFLOW_IN_HARM_MODEL_ARI          /* FhG: fix and undef behaviour bug in the harmonic TCX model arithmetic coder */
 #define FIX_983_DISC_ISM_DIGEST_NUM_OBJS                /* FhG: issue #983: the discrete ISM digest function uses the wrong number of objects */
 
+
+#define FIX_976_USAN_PVQ_ENC_DEC_EVS_CR                      /* Ericsson:  premature cast to unsigned detected by USAN corrected  */
+
+
 /* #################### End BE switches ################################## */
 
 /* #################### Start NON-BE switches ############################ */
diff --git a/lib_dec/pvq_core_dec.c b/lib_dec/pvq_core_dec.c
index 841b31077ab6e67e25a759a27ae47dad7dd54038..a736792c31bad50b98a1443958b3183e840e9428 100644
--- a/lib_dec/pvq_core_dec.c
+++ b/lib_dec/pvq_core_dec.c
@@ -98,6 +98,7 @@ static void pvq_decode_band(
     }
 
     set_s( g_part_s, -32768, Np );
+
     if ( Np > 1 )
     {
         decode_energies( st, hPVQ, Np, dim_part, bits_part, g_part_s, band_bits_tot, bits_left, sfmsize, strict_bits );
@@ -113,10 +114,23 @@ static void pvq_decode_band(
     for ( j = 0; j < Np; j++ )
     {
         g_part[j] = -( (float) g_part_s[j] ) / 32768;
+#ifdef FIX_976_USAN_PVQ_ENC_DEC_EVS_CR
+        /* note: here  g_part   needs to be become exactly  1.0(float) thus in BASOP  Word16 g_part_s is in the negative Q15 domain */
+#endif
+
+
+#ifdef FIX_976_USAN_PVQ_ENC_DEC_EVS_CR
+        /* aligned to BASOP to avoid USAN undefined negation warning for -(-32768) */
+        g_part_s[j] = negate( g_part_s[j] );
+#else
         g_part_s[j] = -g_part_s[j];
+#endif
     }
 
+
     srt_vec_ind( g_part_s, sg_part, idx_sort, Np );
+
+
     for ( j = 0; j < Np; j++ )
     {
         js = idx_sort[Np - 1 - j];
@@ -415,11 +429,16 @@ static void densitySymbolIndexDecode(
 #undef WMC_TOOL_SKIP
 
     res_c = res - c;
+
     if ( c == 0 )
     {
         tot = res * ( res + 1 ) + 1;
         dec_freq = rc_decode( &st->BER_detect, hPVQ, tot );
+#ifdef FIX_976_USAN_PVQ_ENC_DEC_EVS_CR
+        alpha = (int16_t) floor_sqrt_exact( (uint32_t) ( ( res + 1 ) * ( res + 1 ) - dec_freq ) ) + res + 1;
+#else
         alpha = (int16_t) floor_sqrt_exact( (uint32_t) ( res + 1 ) * ( res + 1 ) - dec_freq ) + res + 1;
+#endif
         sym_freq = 2 * ( res - alpha ) + 1;
         cum_freq = alpha * ( 2 * ( res + 1 ) - alpha );
     }
@@ -437,7 +456,12 @@ static void densitySymbolIndexDecode(
         dec_freq = rc_decode( &st->BER_detect, hPVQ, tot );
         if ( dec_freq < tot - ( res + 1 ) - ( res - ( c + 1 ) ) * ( res - c ) * c + c + 1 )
         {
+#ifdef FIX_976_USAN_PVQ_ENC_DEC_EVS_CR
+            alpha = ( res_c - 1 + (int16_t) floor_sqrt_exact( (uint32_t) ( res_c * ( res_c + 4 * dec_freq - 2 ) + 1 ) ) ) / ( 2 * res_c );
+#else
             alpha = ( res_c - 1 + (int16_t) floor_sqrt_exact( (uint32_t) res_c * ( res_c + 4 * dec_freq - 2 ) + 1 ) ) / ( 2 * res_c );
+#endif
+
             sym_freq = 2 * alpha * res_c + 1;
             cum_freq = alpha * ( ( alpha - 1 ) * res_c + 1 );
         }
diff --git a/lib_enc/pvq_core_enc.c b/lib_enc/pvq_core_enc.c
index ddb62560382fc70c93d35737a6c29dbb8aa0f03c..a8ca315ff5fe797b2294a17d90d5969a0c577f7f 100644
--- a/lib_enc/pvq_core_enc.c
+++ b/lib_enc/pvq_core_enc.c
@@ -124,7 +124,12 @@ static void pvq_encode_band(
     for ( j = 0; j < Np; j++ )
     {
         g_part[j] = -( (float) g_part_s[j] ) / 32768;
+#ifdef FIX_976_USAN_PVQ_ENC_DEC_EVS_CR
+        /* aligned to BASOP to avoid USAN undefined negation warning with -(-32768) */
+        g_part_s[j] = negate( g_part_s[j] );
+#else
         g_part_s[j] = -g_part_s[j];
+#endif
     }
 
     srt_vec_ind( g_part_s, sg_part, idx_sort, Np );
diff --git a/scripts/ubsan.supp b/scripts/ubsan.supp
index fc3f22e328b802ceb69a3447e5591957963195f5..c1602085d2fc8036d0b083fbfed56f21e9a30ebe 100644
--- a/scripts/ubsan.supp
+++ b/scripts/ubsan.supp
@@ -30,8 +30,6 @@ implicit-signed-integer-truncation:dec_tcx.c
 implicit-signed-integer-truncation:hdecnrm.c
 implicit-signed-integer-truncation:lib_dec.c
 implicit-signed-integer-truncation:longarith.c
-implicit-signed-integer-truncation:pvq_core_dec.c
-implicit-signed-integer-truncation:pvq_core_enc.c
 implicit-signed-integer-truncation:tcq_position_arith.c
 implicit-signed-integer-truncation:tools.c
 shift-base:basop32.c