diff --git a/clhash.c b/clhash.c
index 5eddfa5f..fc854b1d 100644
--- a/clhash.c
+++ b/clhash.c
@@ -447,5 +447,9 @@ void * get_random_key_for_clhash(uint64_t seed1, uint64_t seed2) {
         a64[128] = xorshift128plus(&k);
         a64[129] = xorshift128plus(&k);
     }
+    while (!a64[2] && !a64[3]) {
+        a64[2] = xorshift128plus(&k);
+        a64[3] = xorshift128plus(&k);
+    }
     return (void*)a64;
 }