diff --git a/pyformlang/regular_expression/python_regex.py b/pyformlang/regular_expression/python_regex.py
index e0f81cf..191b57e 100644
--- a/pyformlang/regular_expression/python_regex.py
+++ b/pyformlang/regular_expression/python_regex.py
@@ -197,9 +197,12 @@ def _preprocess_positive_closure(self):
                 regex_temp.append("*")
         self._python_regex = "".join(regex_temp)
 
+    @staticmethod
+    def _dot_replacer(dot):
+        return DOT_REPLACEMENT
+
     def _preprocess_dot(self):
-        simple_replace = lambda x: DOT_REPLACEMENT
-        self._python_regex = re.sub(r'(?<!\\)\.', simple_replace, self._python_regex)
+        self._python_regex = re.sub(r'(?<!\\)\.', self._dot_replacer, self._python_regex)
 
     def _preprocess_optional(self):
         regex_temp = []
diff --git a/pyformlang/regular_expression/tests/test_python_regex.py b/pyformlang/regular_expression/tests/test_python_regex.py
index a755911..6457556 100644
--- a/pyformlang/regular_expression/tests/test_python_regex.py
+++ b/pyformlang/regular_expression/tests/test_python_regex.py
@@ -201,3 +201,8 @@ def test_backslash(self):
         r_python = re.compile(".*")
         self.assertEqual(r_all.accepts(']'), r_python.match("]") is not None)
         self.assertEqual(r_all.accepts('\\'), r_python.match("\\") is not None)
+
+    def test_escape_dot(self):
+        r_pyformlang = PythonRegex('\\.')
+        r_re = re.compile("\\.")
+        self.assertEqual(r_pyformlang.accepts("."), r_re.match(".") is not None)