diff --git a/tools/cheat-builder/make-acl.zig b/tools/cheat-builder/make-acl.zig
index ba41553..3fece88 100644
--- a/tools/cheat-builder/make-acl.zig
+++ b/tools/cheat-builder/make-acl.zig
@@ -120,9 +120,14 @@ pub fn main() !void {
 }
 
 fn readAll(allocator: Allocator, file: File) ![]u8 {
-    const file_size: usize = @intCast(try file.getEndPos());
+    //const file_size: usize = @intCast(try file.getEndPos());
+    //const file_contents = try allocator.alloc(u8, file_size);
+    try file.seekFromEnd(0);
+    const file_size = try file.getPos();
     const file_contents = try allocator.alloc(u8, file_size);
 
+    try file.seekTo(0);
+
     const readed = try file.readAll(file_contents);
     if (readed != file_size) {
         return error.EndOfStream;