diff --git a/lib_rend/ivas_dirac_output_synthesis_dec_fx.c b/lib_rend/ivas_dirac_output_synthesis_dec_fx.c
index 37b5f1e0594514c89068b2ada54fbe1d785c9321..9212e3d235c09646fabc37080558851d6201c17f 100644
--- a/lib_rend/ivas_dirac_output_synthesis_dec_fx.c
+++ b/lib_rend/ivas_dirac_output_synthesis_dec_fx.c
@@ -2166,15 +2166,25 @@ void ivas_dirac_dec_output_synthesis_process_subframe_psd_ls_fx(
         move32();
 
         W_temp = W_add( W_mult0_32_32( a, subtract_power_y ), W_mult0_32_32( b, masa_stereo_type_detect->subtract_power_y_smooth_fx ) ); // Q31 + masa_stereo_type_detect->q_subtract_power_y_smooth
-        exp = W_norm( W_temp );
-        masa_stereo_type_detect->subtract_power_y_smooth_fx = W_extract_h( W_shl( W_temp, exp ) ); // Q31 + masa_stereo_type_detect->q_subtract_power_y_smooth + exp - 32
-        move32();
-        masa_stereo_type_detect->q_subtract_power_y_smooth = sub( add( masa_stereo_type_detect->q_subtract_power_y_smooth, exp ), 1 );
-        move16();
-
+        IF( W_temp )
+        {
+            exp = W_norm( W_temp );
+            masa_stereo_type_detect->subtract_power_y_smooth_fx = W_extract_h( W_shl( W_temp, exp ) ); // Q31 + masa_stereo_type_detect->q_subtract_power_y_smooth + exp - 32
+            move32();
+            masa_stereo_type_detect->q_subtract_power_y_smooth = sub( add( masa_stereo_type_detect->q_subtract_power_y_smooth, exp ), 1 );
+            move16();
+        }
+        ELSE
+        {
+            masa_stereo_type_detect->subtract_power_y_smooth_fx = 0; // Q31
+            move32();
+            masa_stereo_type_detect->q_subtract_power_y_smooth = Q31;
+            move16();
+        }
         exp = 0;
         move16();
-        IF( masa_stereo_type_detect->target_power_y_smooth_fx != 0 )
+        test();
+        IF( masa_stereo_type_detect->target_power_y_smooth_fx && masa_stereo_type_detect->subtract_power_y_smooth_fx )
         {
             subtract_target_ratio = L_sub( BASOP_Util_Log2( masa_stereo_type_detect->subtract_power_y_smooth_fx ),
                                            BASOP_Util_Log2( masa_stereo_type_detect->target_power_y_smooth_fx ) ); // Q25