diff --git a/libavcodec/ra144.c b/libavcodec/ra144.c
index 01cbc86f3e..5661bdc6f6 100644
--- a/libavcodec/ra144.c
+++ b/libavcodec/ra144.c
@@ -138,8 +138,13 @@ static void add_wav(int16_t *dest, int n, int skip_first, int *m,
     for (i=!skip_first; i<3; i++)
         v[i] = (gain_val_tab[n][i] * m[i]) >> gain_exp_tab[n];
 
+    if (v[0]) {
     for (i=0; i < BLOCKSIZE; i++)
         dest[i] = (s1[i]*v[0] + s2[i]*v[1] + s3[i]*v[2]) >> 12;
+    } else {
+        for (i=0; i < BLOCKSIZE; i++)
+            dest[i] = (s2[i]*v[1] + s3[i]*v[2]) >> 12;
+    }
 }
 
 static unsigned int rescale_rms(unsigned int rms, unsigned int energy)