diff --git a/httprunner/loader/check.py b/httprunner/loader/check.py
index 888d38d3..2f7720f4 100644
--- a/httprunner/loader/check.py
+++ b/httprunner/loader/check.py
@@ -1,6 +1,5 @@
 import json
 import os
-import types
 
 import jsonschema
 
@@ -199,9 +198,3 @@ def is_testcase_path(path):
             return False
 
     return True
-
-
-def is_function(item):
-    """ Takes item object, returns True if it is a function.
-    """
-    return isinstance(item, types.FunctionType)
diff --git a/httprunner/loader/load.py b/httprunner/loader/load.py
index bf75d20e..27fe0455 100644
--- a/httprunner/loader/load.py
+++ b/httprunner/loader/load.py
@@ -2,12 +2,12 @@ import csv
 import io
 import json
 import os
+import types
 
 import yaml
 
 from httprunner import builtin
 from httprunner import exceptions, logger, utils
-from httprunner.loader.check import is_function
 from httprunner.loader.locate import get_project_working_directory
 
 try:
@@ -206,7 +206,7 @@ def load_module_functions(module):
     module_functions = {}
 
     for name, item in vars(module).items():
-        if is_function(item):
+        if isinstance(item, types.FunctionType):
             module_functions[name] = item
 
     return module_functions
diff --git a/tests/test_loader/test_check.py b/tests/test_loader/test_check.py
index 6160ad88..82325a96 100644
--- a/tests/test_loader/test_check.py
+++ b/tests/test_loader/test_check.py
@@ -5,11 +5,6 @@ from httprunner.loader import check
 
 class TestLoaderCheck(unittest.TestCase):
 
-    def test_is_function(self):
-        func = lambda x: x + 1
-        self.assertTrue(check.is_function(func))
-        self.assertTrue(check.is_function(check.is_testcase))
-
     def test_is_testcases(self):
         data_structure = "path/to/file"
         self.assertFalse(check.is_testcases(data_structure))