diff --git a/lib_com/options.h b/lib_com/options.h
index 7a60330ace8187340d31cb171b63e517b7cd5d26..d3f4272ca0f90bfe6fe95316381cf7b1875fe56b 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -215,6 +215,7 @@
 #define FIX_618_STEREO_SW_DIV_BY_ZERO                   /* VA: fix issue 618 - UBSAN: division-by-zero in stereo bitrate switching */
 #define FIX_625_IDX_OOB                                 /* FhG: Fix index out-of-bounds UBSAN error (issue 625) */
 #define FIX_613_DIRAC_NULL_PTR_USAN                     /* Nokia: Issue #613: USAN in DirAC decoder setup */
+#define FIX_647_SILENT_W_PARAMBIN                       /* Nokia: Issue #647: Fix silent W SH inputs in parametric binauralizer */
 
 #define MASA_AND_OBJECTS                                /* Nokia: Combination of MASA and objects */
 #define FIX_653_BUG_IN_SKIP_MATRIX                      /* Dlb: fix for issue #653, bug in the ivas_spar_get_skip_mat function*/
diff --git a/lib_rend/ivas_dirac_dec_binaural_functions.c b/lib_rend/ivas_dirac_dec_binaural_functions.c
index c729f964ad94b99114a44db53c2523762732508f..c04ff82cbf7cdf9d87f13a51fde1987e20c817bb 100644
--- a/lib_rend/ivas_dirac_dec_binaural_functions.c
+++ b/lib_rend/ivas_dirac_dec_binaural_functions.c
@@ -55,6 +55,9 @@
 #define CLDFB_HALF_BIN_FREQUENCY_OFFSET         0.5f
 #define IVAS_TDET_DUCK_MULT_FAC_PARA_BIN        ( 2.0f )
 #define IVAS_TDET_DUCK_MULT_FAC_PARA_BIN_LOW_BR ( 3.0f )
+#ifdef FIX_647_SILENT_W_PARAMBIN
+#define SBA_CARDI_TARGET_ENERGY_GAIN 0.5f
+#endif
 
 #ifdef MASA_AND_OBJECTS
 #define STEREO_PREPROCESS_IIR_FACTOR ( 0.9f )
@@ -1231,18 +1234,36 @@ static void ivas_dirac_dec_binaural_formulate_input_covariance_matrices(
     if ( ivas_format == SBA_FORMAT && nchan_transport == 2 )
     {
         float tempRe, tempIm;
+#ifdef FIX_647_SILENT_W_PARAMBIN
+        float subFrameSumEne[CLDFB_NO_CHANNELS_MAX];
+
+        v_multc( subFrameTotalEne, SBA_CARDI_TARGET_ENERGY_GAIN, subFrameTotalEne, nBins );
 
+        set_zero( subFrameSumEne, CLDFB_NO_CHANNELS_MAX );
+#else
         set_zero( subFrameTotalEne, CLDFB_NO_CHANNELS_MAX );
 
+#endif
         for ( slot = 0; slot < hSpatParamRendCom->subframe_nbslots[subframe]; slot++ )
         {
             for ( bin = 0; bin < nBins; bin++ )
             {
                 tempRe = inRe[0][slot][bin] + inRe[1][slot][bin];
                 tempIm = inIm[0][slot][bin] + inIm[1][slot][bin];
+#ifdef FIX_647_SILENT_W_PARAMBIN
+                subFrameSumEne[bin] += tempRe * tempRe + tempIm * tempIm;
+#else
                 subFrameTotalEne[bin] += tempRe * tempRe + tempIm * tempIm;
+#endif
             }
         }
+
+#ifdef FIX_647_SILENT_W_PARAMBIN
+        for ( bin = 0; bin < nBins; bin++ )
+        {
+            subFrameTotalEne[bin] = max( subFrameTotalEne[bin], subFrameSumEne[bin] );
+        }
+#endif
     }
 
     /* Temporal IIR-type smoothing of covariance matrices. Also apply encoding quality based smoothing factor. */