diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index 19dfca9ff7d7d..fd09465d82ca6 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -88,7 +88,7 @@ static int rbtree_test_init(void)
 
 	printk(KERN_ALERT "rbtree testing");
 
-	prandom32_seed(&rnd, 3141592653589793238);
+	prandom32_seed(&rnd, 3141592653589793238ULL);
 	init();
 
 	time1 = get_cycles();