diff --git a/lib/auxlib.h b/lib/auxlib.h
index 24cbd42d0..fab00e7f8 100644
--- a/lib/auxlib.h
+++ b/lib/auxlib.h
@@ -700,7 +700,7 @@ INLINE void bf_copy(atomic64 *u, const uint64_t f,
 }
 /* works for multiple flags */
 INLINE void bf_copy_same(atomic64 *u, const atomic64 *s, const uint64_t g) {
-	unsigned int old, set, clear;
+	uint64_t old, set, clear;
 	old = atomic64_get(s);
 	set = old & g;
 	clear = ~old & g;