diff --git a/cyaron/tests/compare_test.py b/cyaron/tests/compare_test.py
index bc0a830..c0abfc8 100644
--- a/cyaron/tests/compare_test.py
+++ b/cyaron/tests/compare_test.py
@@ -4,7 +4,7 @@
 import shutil
 import tempfile
 import subprocess
-from cyaron import IO, Compare, log
+from cyaron import IO, Compare, log, escape_path
 from cyaron.output_capture import captured_output
 from cyaron.graders.mismatch import *
 from cyaron.compare import CompareMismatch
@@ -83,13 +83,13 @@ def test_fulltext_program(self):
 
         try:
             with captured_output() as (out, err):
-                Compare.program(f"{sys.executable} correct.py",
-                                f"{sys.executable} incorrect.py",
+                Compare.program(f"{escape_path(sys.executable)} correct.py",
+                                f"{escape_path(sys.executable)} incorrect.py",
                                 std=io,
                                 input=io,
                                 grader="FullText")
         except CompareMismatch as e:
-            self.assertEqual(e.name, f'{sys.executable} incorrect.py')
+            self.assertEqual(e.name, f'{escape_path(sys.executable)} incorrect.py')
             e = e.mismatch
             self.assertEqual(e.content, '2\n')
             self.assertEqual(e.std, '1\n')
@@ -105,7 +105,7 @@ def test_fulltext_program(self):
             self.assertTrue(False)
 
         result = out.getvalue().strip()
-        correct_out = f'{sys.executable} correct.py: Correct \n{sys.executable} incorrect.py: !!!INCORRECT!!! Hash mismatch: read 53c234e5e8472b6ac51c1ae1cab3fe06fad053beb8ebfd8977b010655bfdd3c3, expected 4355a46b19d348dc2f57c046f8ef63d4538ebb936000f3c9ee954a27460dd865'
+        correct_out = f'{escape_path(sys.executable)} correct.py: Correct \n{escape_path(sys.executable)} incorrect.py: !!!INCORRECT!!! Hash mismatch: read 53c234e5e8472b6ac51c1ae1cab3fe06fad053beb8ebfd8977b010655bfdd3c3, expected 4355a46b19d348dc2f57c046f8ef63d4538ebb936000f3c9ee954a27460dd865'
         self.assertEqual(result, correct_out)
 
     def test_file_input(self):
@@ -122,13 +122,13 @@ def test_file_input(self):
         io.input_writeln("233")
 
         with captured_output() as (out, err):
-            Compare.program(f"{sys.executable} correct.py",
-                            std_program=f"{sys.executable} std.py",
+            Compare.program(f"{escape_path(sys.executable)} correct.py",
+                            std_program=f"{escape_path(sys.executable)} std.py",
                             input=io,
                             grader="NOIPStyle")
 
         result = out.getvalue().strip()
-        correct_out = f'{sys.executable} correct.py: Correct'
+        correct_out = f'{escape_path(sys.executable)} correct.py: Correct'
         self.assertEqual(result, correct_out)
 
     def test_concurrent(self):
diff --git a/cyaron/tests/io_test.py b/cyaron/tests/io_test.py
index 02b5a98..7e172d7 100644
--- a/cyaron/tests/io_test.py
+++ b/cyaron/tests/io_test.py
@@ -5,7 +5,7 @@
 import shutil
 import tempfile
 import subprocess
-from cyaron import IO
+from cyaron import IO, escape_path
 from cyaron.output_capture import captured_output
 
 
@@ -92,7 +92,7 @@ def test_output_gen_time_limit_exceeded(self):
                 abs_input_filename: str = os.path.abspath(input_filename)
                 with self.assertRaises(subprocess.TimeoutExpired):
                     test.input_writeln(abs_input_filename)
-                    test.output_gen(f'"{sys.executable}" long_time.py',
+                    test.output_gen(f'{escape_path(sys.executable)} long_time.py',
                                     time_limit=TIMEOUT)
                 time.sleep(WAIT_TIME)
                 try:
@@ -108,7 +108,7 @@ def test_output_gen_time_limit_not_exceeded(self):
                         "print(1)")
 
             with IO("test_gen.in", "test_gen.out") as test:
-                test.output_gen(f'"{sys.executable}" short_time.py',
+                test.output_gen(f'{escape_path(sys.executable)} short_time.py',
                                 time_limit=0.5)
         with open("test_gen.out", encoding="utf-8") as f:
             output = f.read()
diff --git a/cyaron/utils.py b/cyaron/utils.py
index 4ef5ad8..38d4c2e 100644
--- a/cyaron/utils.py
+++ b/cyaron/utils.py
@@ -1,11 +1,13 @@
 """Some utility functions."""
+import os
+import shlex
 import sys
 import random
 from typing import cast, Any, Dict, Iterable, Tuple, Union
 
 __all__ = [
     "ati", "list_like", "int_like", "strtolines", "make_unicode",
-    "unpack_kwargs", "process_args"
+    "unpack_kwargs", "process_args", "escape_path"
 ]
 
 
@@ -79,3 +81,10 @@ def process_args():
     for s in sys.argv:
         if s.startswith("--randseed="):
             random.seed(s.split("=")[1])
+
+def escape_path(path: str) -> str:
+    """Escape the path."""
+    if os.name == 'nt':
+        return '"' + path.replace('\\', '/') + '"'
+    else:
+        return shlex.quote(path)