diff --git a/lib/des/rnd_keys.c b/lib/des/rnd_keys.c
index 6b5872f7e..689c7b9bb 100644
--- a/lib/des/rnd_keys.c
+++ b/lib/des/rnd_keys.c
@@ -121,6 +121,8 @@ des_rand_data(unsigned char *data, int size)
 {
   int i;
 
+  srandom (time (NULL));
+
   for(i = 0; i < size; ++i)
     data[i] = random() % 0x100;
 }