diff --git a/libaf/af_ladspa.c b/libaf/af_ladspa.c
index 92fe33fb19..9aa42ab387 100644
--- a/libaf/af_ladspa.c
+++ b/libaf/af_ladspa.c
@@ -547,7 +547,7 @@ static int control(struct af_instance_s *af, int cmd, void *arg) {
 
         af->data->rate   = ((af_data_t*)arg)->rate;
         af->data->nch    = ((af_data_t*)arg)->nch;
-        af->data->format = AF_FORMAT_SI | AF_FORMAT_NE;
+        af->data->format = AF_FORMAT_S16_NE;
         af->data->bps    = 2;
 
         /* arg->len is not set here yet, so init of buffers and connecting the