diff --git a/lib/std/priority_dequeue.zig b/lib/std/priority_dequeue.zig
index 9df8c07f7eedd524410e9a0f52970f20165c821e..5dd861bcbd45773a138874a97291fdacb95bc17c 100644
--- a/lib/std/priority_dequeue.zig
+++ b/lib/std/priority_dequeue.zig
@@ -81,7 +81,7 @@ pub fn PriorityDequeue(comptime T: type) type {
             // next two are on a max layer;
             // next four are on a min layer, and so on.
             const leading_zeros = @clz(usize, index + 1);
-            const highest_set_bit = 63 - leading_zeros;
+            const highest_set_bit = @bitSizeOf(usize) - 1 - leading_zeros;
             return (highest_set_bit & 1) == 0;
         }