diff --git a/dmoj/executors/ZIG.py b/dmoj/executors/ZIG.py
index 958027442..ac8b396b0 100644
--- a/dmoj/executors/ZIG.py
+++ b/dmoj/executors/ZIG.py
@@ -11,13 +11,13 @@ class Executor(CompiledExecutor):
 
 pub fn main() !void {
     const io = std.io;
-    const stdin = std.io.getStdIn().inStream();
-    const stdout = std.io.getStdOut().outStream();
+    const stdin = std.io.getStdIn().reader();
+    const stdout = std.io.getStdOut().writer();
 
     var line_buf: [50]u8 = undefined;
     while (try stdin.readUntilDelimiterOrEof(&line_buf, '\n')) |line| {
         if (line.len == 0) break;
-        try stdout.print("{}", .{line});
+        try stdout.print("{s}", .{line});
     }
 }"""
 
@@ -28,7 +28,7 @@ def create_files(self, problem_id, source_code, *args, **kwargs):
         super().create_files(problem_id, source_code, *args, **kwargs)
 
     def get_compile_args(self):
-        return [self.get_command(), 'build-exe', self._code, '--release-safe', '--name', self.problem]
+        return [self.get_command(), 'build-exe', self._code, '-O', 'ReleaseSafe', '--name', self.problem]
 
     @classmethod
     def get_version_flags(cls, command):