diff --git a/Lib/pathlib/_os.py b/Lib/pathlib/_os.py
index ee8657f427efbd..e3751bbcb62377 100644
--- a/Lib/pathlib/_os.py
+++ b/Lib/pathlib/_os.py
@@ -186,6 +186,12 @@ def magic_open(path, mode='r', buffering=-1, encoding=None, errors=None,
             pass
         else:
             return attr(path, buffering, encoding, errors, newline)
+    elif encoding is not None:
+        raise ValueError("binary mode doesn't take an encoding argument")
+    elif errors is not None:
+        raise ValueError("binary mode doesn't take an errors argument")
+    elif newline is not None:
+        raise ValueError("binary mode doesn't take a newline argument")
 
     try:
         attr = getattr(cls, f'__open_{mode}b__')
diff --git a/Lib/test/test_pathlib/test_read.py b/Lib/test/test_pathlib/test_read.py
index 938d3a1e987128..0087aacbc39161 100644
--- a/Lib/test/test_pathlib/test_read.py
+++ b/Lib/test/test_pathlib/test_read.py
@@ -39,6 +39,9 @@ def test_open_rb(self):
         p = self.root / 'fileA'
         with magic_open(p, 'rb') as f:
             self.assertEqual(f.read(), b'this is file A\n')
+        self.assertRaises(ValueError, magic_open, p, 'rb', encoding='utf8')
+        self.assertRaises(ValueError, magic_open, p, 'rb', errors='strict')
+        self.assertRaises(ValueError, magic_open, p, 'rb', newline='')
 
     def test_read_bytes(self):
         p = self.root / 'fileA'
diff --git a/Lib/test/test_pathlib/test_write.py b/Lib/test/test_pathlib/test_write.py
index 040af7be152fc2..d302e0a9caa889 100644
--- a/Lib/test/test_pathlib/test_write.py
+++ b/Lib/test/test_pathlib/test_write.py
@@ -41,6 +41,9 @@ def test_open_wb(self):
             #self.assertIsInstance(f, io.BufferedWriter)
             f.write(b'this is file A\n')
         self.assertEqual(self.ground.readbytes(p), b'this is file A\n')
+        self.assertRaises(ValueError, magic_open, p, 'wb', encoding='utf8')
+        self.assertRaises(ValueError, magic_open, p, 'wb', errors='strict')
+        self.assertRaises(ValueError, magic_open, p, 'wb', newline='')
 
     def test_write_bytes(self):
         p = self.root / 'fileA'