diff --git a/src/link/Elf/ZigObject.zig b/src/link/Elf/ZigObject.zig
index fda86f8125690f2b9eb50ec9d340d9b001977e45..a6ac6cfc115a77b7bd3563c24d3dc4b8aa206dee 100644
--- a/src/link/Elf/ZigObject.zig
+++ b/src/link/Elf/ZigObject.zig
@@ -554,7 +554,7 @@ pub fn writeAr(self: ZigObject, elf_file: *Elf, writer: anytype) !void {
 
     const hdr = Archive.setArHdr(.{
         .name = if (name.len <= 15) .{ .name = name } else .{ .name_off = self.output_ar_state.name_off },
-        .size = size,
+        .size = @intCast(size),
     });
     try writer.writeAll(mem.asBytes(&hdr));
     try writer.writeAll(contents);