diff --git a/lib_enc/speech_music_classif_fx.c b/lib_enc/speech_music_classif_fx.c
index b088e6efd0570dff4fca9ad48b2d51c7d9592d9a..8d6abfddd04a2ab8166c648bd5ffdc85d57c7dd0 100644
--- a/lib_enc/speech_music_classif_fx.c
+++ b/lib_enc/speech_music_classif_fx.c
@@ -2394,7 +2394,7 @@ Word16 ivas_smc_gmm_fx(
         }
         ELSE IF( hSpMusClas->wdrop_fx > 0 )
         {
-            hSpMusClas->wdrop_fx = extract_l( L_shr( L_sub( hSpMusClas->dlp_mean_ST_fx, dlp_fx ), 10 ) );
+            hSpMusClas->wdrop_fx = add( hSpMusClas->wdrop_fx, extract_l( L_shr( L_sub( hSpMusClas->dlp_mean_ST_fx, dlp_fx ), 10 ) ) );
         }
     }
     ELSE