diff --git a/lib/std/os/uefi/pool_allocator.zig b/lib/std/os/uefi/pool_allocator.zig
index 8e2d9fe3fc..8f26aac32c 100644
--- a/lib/std/os/uefi/pool_allocator.zig
+++ b/lib/std/os/uefi/pool_allocator.zig
@@ -22,7 +22,7 @@ const UefiPoolAllocator = struct {
 
         assert(len > 0);
 
-        const ptr_align = @as(usize, 1) << @as(Allocator.Log2Align, log2_ptr_align);
+        const ptr_align = @as(usize, 1) << @intCast(Allocator.Log2Align, log2_ptr_align);
 
         const metadata_len = mem.alignForward(@sizeOf(usize), ptr_align);