diff --git a/src/link/MachO/CodeSignature.zig b/src/link/MachO/CodeSignature.zig
index 116ed254f861dc83d4fc2b5e365487841798335f..8bc00d9181a5152b0a9046ecffb7f781f0e4aeaf 100644
--- a/src/link/MachO/CodeSignature.zig
+++ b/src/link/MachO/CodeSignature.zig
@@ -353,7 +353,7 @@ fn parallelHash(
     gpa: Allocator,
     pool: *ThreadPool,
     file: fs.File,
-    file_size: u64,
+    file_size: u32,
 ) !void {
     var wg: WaitGroup = .{};