diff --git a/src/link/MachO.zig b/src/link/MachO.zig
index 2e21aa1af921633ce0eb98fd3c3987fc875baa8f..ada695d6a759ad5e1e4b1815ea743102afced039 100644
--- a/src/link/MachO.zig
+++ b/src/link/MachO.zig
@@ -1278,7 +1278,7 @@ pub fn createStubHelperPreambleAtom(self: *MachO) !void {
 
     const gpa = self.base.allocator;
     const arch = self.base.options.target.cpu.arch;
-    const size: u64 = switch (arch) {
+    const size: u5 = switch (arch) {
         .x86_64 => 15,
         .aarch64 => 6 * @sizeOf(u32),
         else => unreachable,