diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index ee8e6de..f7bb706 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -130,16 +130,16 @@
 #endif
 
 	INIT(onestwos);
-	BUG_ON(atomic64_inc_not_zero(&v));
+	BUG_ON(!atomic64_inc_not_zero(&v));
 	r += one;
 	BUG_ON(v.counter != r);
 
 	INIT(0);
-	BUG_ON(!atomic64_inc_not_zero(&v));
+	BUG_ON(atomic64_inc_not_zero(&v));
 	BUG_ON(v.counter != r);
 
 	INIT(-one);
-	BUG_ON(atomic64_inc_not_zero(&v));
+	BUG_ON(!atomic64_inc_not_zero(&v));
 	r += one;
 	BUG_ON(v.counter != r);