diff --git a/autograder_sandbox/autograder_sandbox.py b/autograder_sandbox/autograder_sandbox.py
index 62fad34..5283748 100644
--- a/autograder_sandbox/autograder_sandbox.py
+++ b/autograder_sandbox/autograder_sandbox.py
@@ -272,7 +272,6 @@ def environment_variables(self) -> Mapping[str, str]:
 
     def run_command(self,
                     args: List[str],
-                    max_num_processes: Optional[int] = None,
                     max_stack_size: Optional[int] = None,
                     max_virtual_memory: Optional[int] = None,
                     as_root: bool = False,
@@ -287,9 +286,6 @@ def run_command(self,
         :param args: A list of strings that specify which command should
             be run inside the sandbox.
 
-        :param max_num_processes: The maximum number of processes the
-            command is allowed to spawn.
-
         :param max_stack_size: The maximum stack size, in bytes, allowed
             for the command.
 
@@ -318,9 +314,6 @@ def run_command(self,
         if stdin is None:
             cmd.append('--stdin_devnull')
 
-        if max_num_processes is not None:
-            cmd += ['--max_num_processes', str(max_num_processes)]
-
         if max_stack_size is not None:
             cmd += ['--max_stack_size', str(max_stack_size)]
 
diff --git a/autograder_sandbox/docker-image-setup/cmd_runner.py b/autograder_sandbox/docker-image-setup/cmd_runner.py
index d849a79..496f1a0 100644
--- a/autograder_sandbox/docker-image-setup/cmd_runner.py
+++ b/autograder_sandbox/docker-image-setup/cmd_runner.py
@@ -124,7 +124,6 @@ def set_subprocess_rlimits():
 def parse_args():
     parser = argparse.ArgumentParser()
     parser.add_argument("--timeout", type=int)
-    parser.add_argument("--max_num_processes", type=int)
     parser.add_argument("--max_stack_size", type=int)
     parser.add_argument("--max_virtual_memory", type=int)
     parser.add_argument("--truncate_stdout", type=int)
diff --git a/autograder_sandbox/tests.py b/autograder_sandbox/tests.py
index d2f0a1f..cb99454 100644
--- a/autograder_sandbox/tests.py
+++ b/autograder_sandbox/tests.py
@@ -170,7 +170,6 @@ def test_command_tries_to_read_from_stdin_when_stdin_arg_is_none(self) -> None:
         with AutograderSandbox() as sandbox:
             result = sandbox.run_command(
                 ['python3', '-c', "import sys; sys.stdin.read(); print('done')"],
-                max_num_processes=10,
                 max_stack_size=10000000,
                 max_virtual_memory=500000000,
                 timeout=2,