diff --git a/lib_enc/ivas_core_enc_fx.c b/lib_enc/ivas_core_enc_fx.c
index 1e7a13d4540aff74c0ec06175475fcd69a12c697..081e1281491241425b6229d7ce21b7dcd244fea7 100644
--- a/lib_enc/ivas_core_enc_fx.c
+++ b/lib_enc/ivas_core_enc_fx.c
@@ -445,12 +445,20 @@ ivas_error ivas_core_enc_fx(
                         move16();
                     }
 
-                    Scale_sig( st->input_fx, input_frame, negate( st->q_inp ) );                // Q0
-                    Scale_sig( st->old_input_signal_fx, input_frame, negate( st->q_old_inp ) ); // Q0
-                    st->q_old_inp = 0;
-                    move16();
-                    st->q_inp = 0;
-                    move16();
+                    test();
+                    test();
+                    test();
+                    test();
+                    test();
+                    IF( ( st->q_old_inp < 0 && st->q_inp < 0 && norm_arr( st->input_fx, input_frame ) && norm_arr( st->old_input_signal_fx, input_frame ) ) || ( st->q_old_inp > 0 && st->q_inp > 0 ) )
+                    {
+                        scale_sig( st->input_fx, input_frame, negate( st->q_inp ) );                // Q0
+                        scale_sig( st->old_input_signal_fx, input_frame, negate( st->q_old_inp ) ); // Q0
+                        st->q_old_inp = 0;
+                        move16();
+                        st->q_inp = 0;
+                        move16();
+                    }
                 }
                 Word16 Q_spec_old[2], L_spec;
                 Q_spec_old[0] = hCPE->hCoreCoder[0]->hTcxEnc->spectrum_long_e;