diff --git a/libavcodec/nellymoserdec.c b/libavcodec/nellymoserdec.c
index 1281beaf61..0f2a826ccf 100644
--- a/libavcodec/nellymoserdec.c
+++ b/libavcodec/nellymoserdec.c
@@ -121,8 +121,8 @@ static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *
     top2 = 2*NELLY_BUF_LEN-1;
 
     while (bot < NELLY_BUF_LEN/2) {
-        audio[bot] =  (- a_in[bot]*sine_window[bot]-state[bot]*sine_window[top])/s->scale_bias;
-        audio[top] =  (-state[bot]*sine_window[bot]+ a_in[bot]*sine_window[top])/s->scale_bias;
+        audio[bot] =  (- a_in[bot]*sine_window[bot]-state[bot]*sine_window[top])/s->scale_bias + s->add_bias;
+        audio[top] =  (-state[bot]*sine_window[bot]+ a_in[bot]*sine_window[top])/s->scale_bias + s->add_bias;
         state[bot] =  a_in[top2];
 
         bot++;