diff --git a/libavcodec/resample.c b/libavcodec/resample.c
index f4d6a0aae7..76521a75e0 100644
--- a/libavcodec/resample.c
+++ b/libavcodec/resample.c
@@ -191,7 +191,7 @@ int audio_resample(ReSampleContext *s, short *output, short *input, int nb_sampl
     }
 
     /* make some zoom to avoid round pb */
-    lenout= (int)(nb_samples * s->ratio) + 16;
+    lenout= (int)(4*nb_samples * s->ratio) + 16;
     bufout[0]= (short*) av_malloc( lenout * sizeof(short) );
     bufout[1]= (short*) av_malloc( lenout * sizeof(short) );