diff --git a/_pytest/mark.py b/_pytest/mark.py
index b49f0fc64..3cac9dc91 100644
--- a/_pytest/mark.py
+++ b/_pytest/mark.py
@@ -75,7 +75,7 @@ class ParameterSet(namedtuple('ParameterSet', 'values, marks, id')):
         return cls(argval, marks=newmarks, id=None)
 
     @classmethod
-    def _for_parameterize(cls, argnames, argvalues, function, config):
+    def _for_parametrize(cls, argnames, argvalues, function, config):
         if not isinstance(argnames, (tuple, list)):
             argnames = [x.strip() for x in argnames.split(",") if x.strip()]
             force_tuple = len(argnames) == 1
diff --git a/_pytest/python.py b/_pytest/python.py
index 2a84677ec..fb7bac8b8 100644
--- a/_pytest/python.py
+++ b/_pytest/python.py
@@ -785,7 +785,8 @@ class Metafunc(fixtures.FuncargnamesCompatAttr):
         from _pytest.fixtures import scope2index
         from _pytest.mark import ParameterSet
         from py.io import saferepr
-        argnames, parameters = ParameterSet._for_parameterize(
+
+        argnames, parameters = ParameterSet._for_parametrize(
             argnames, argvalues, self.function, self.config)
         del argvalues
 
diff --git a/changelog/3166.trivial b/changelog/3166.trivial
new file mode 100644
index 000000000..ce92840cb
--- /dev/null
+++ b/changelog/3166.trivial
@@ -0,0 +1 @@
+Rename ``ParameterSet._for_parameterize()`` to ``_for_parametrize()`` in order to comply with the naming convention.