diff --git a/lib/ldpc/dec.c b/lib/ldpc/dec.c
index d87f962f4..68029115f 100755
--- a/lib/ldpc/dec.c
+++ b/lib/ldpc/dec.c
@@ -392,6 +392,7 @@ void ldpc_decode_ ( double lratio[], char decoded[], int *max_iterations, int *n
   float fac;
   
   max_iter=*max_iterations;
+  srand(-1);
   for (itry=0; itry< *max_dither; itry++) {
     for (i=0; i<N; i++) {
        if( itry == 0 ) {