diff --git a/django/db/models/fields/files.py b/django/db/models/fields/files.py
index 9d4a06daca..0b2a24a895 100644
--- a/django/db/models/fields/files.py
+++ b/django/db/models/fields/files.py
@@ -270,9 +270,7 @@ class FileField(Field):
 
     def deconstruct(self):
         name, path, args, kwargs = super(FileField, self).deconstruct()
-        if kwargs.get("max_length", None) != 100:
-            kwargs["max_length"] = 100
-        else:
+        if kwargs.get("max_length", None) == 100:
             del kwargs["max_length"]
         kwargs['upload_to'] = self.upload_to
         if self.storage is not default_storage:
diff --git a/tests/field_deconstruction/tests.py b/tests/field_deconstruction/tests.py
index 3fea7ae853..0d24c2a268 100644
--- a/tests/field_deconstruction/tests.py
+++ b/tests/field_deconstruction/tests.py
@@ -128,6 +128,11 @@ class FieldDeconstructionTests(TestCase):
         self.assertEqual(path, "django.db.models.FileField")
         self.assertEqual(args, [])
         self.assertEqual(kwargs, {"upload_to": "foo/bar"})
+        field = models.FileField(upload_to="foo/bar", max_length=200)
+        name, path, args, kwargs = field.deconstruct()
+        self.assertEqual(path, "django.db.models.FileField")
+        self.assertEqual(args, [])
+        self.assertEqual(kwargs, {"upload_to": "foo/bar", "max_length": 200})
 
     def test_file_path_field(self):
         field = models.FilePathField(match=".*\.txt$")
@@ -135,11 +140,11 @@ class FieldDeconstructionTests(TestCase):
         self.assertEqual(path, "django.db.models.FilePathField")
         self.assertEqual(args, [])
         self.assertEqual(kwargs, {"match": ".*\.txt$"})
-        field = models.FilePathField(recursive=True, allow_folders=True)
+        field = models.FilePathField(recursive=True, allow_folders=True, max_length=123)
         name, path, args, kwargs = field.deconstruct()
         self.assertEqual(path, "django.db.models.FilePathField")
         self.assertEqual(args, [])
-        self.assertEqual(kwargs, {"recursive": True, "allow_folders": True})
+        self.assertEqual(kwargs, {"recursive": True, "allow_folders": True, "max_length": 123})
 
     def test_float_field(self):
         field = models.FloatField()
@@ -276,11 +281,11 @@ class FieldDeconstructionTests(TestCase):
         self.assertEqual(path, "django.db.models.SlugField")
         self.assertEqual(args, [])
         self.assertEqual(kwargs, {})
-        field = models.SlugField(db_index=False)
+        field = models.SlugField(db_index=False, max_length=231)
         name, path, args, kwargs = field.deconstruct()
         self.assertEqual(path, "django.db.models.SlugField")
         self.assertEqual(args, [])
-        self.assertEqual(kwargs, {"db_index": False})
+        self.assertEqual(kwargs, {"db_index": False, "max_length": 231})
 
     def test_small_integer_field(self):
         field = models.SmallIntegerField()
@@ -302,3 +307,9 @@ class FieldDeconstructionTests(TestCase):
         self.assertEqual(path, "django.db.models.URLField")
         self.assertEqual(args, [])
         self.assertEqual(kwargs, {})
+        field = models.URLField(max_length=231)
+        name, path, args, kwargs = field.deconstruct()
+        self.assertEqual(path, "django.db.models.URLField")
+        self.assertEqual(args, [])
+        self.assertEqual(kwargs, {"max_length": 231})
+