diff --git a/src/_pytest/compat.py b/src/_pytest/compat.py
index e4072ecdb..7abd3d53f 100644
--- a/src/_pytest/compat.py
+++ b/src/_pytest/compat.py
@@ -83,7 +83,7 @@ def iscoroutinefunction(func):
 
 def getlocation(function, curdir):
     fn = py.path.local(inspect.getfile(function))
-    lineno = py.builtin._getcode(function).co_firstlineno
+    lineno = function.__code__.co_firstlineno
     if fn.relto(curdir):
         fn = fn.relto(curdir)
     return "%s:%d" % (fn, lineno + 1)
diff --git a/src/_pytest/fixtures.py b/src/_pytest/fixtures.py
index bfae4cb61..495e6b9b3 100644
--- a/src/_pytest/fixtures.py
+++ b/src/_pytest/fixtures.py
@@ -354,8 +354,7 @@ class FixtureRequest(FuncargnamesCompatAttr):
             return self._pyfuncitem._testcase
         except AttributeError:
             function = getattr(self, "function", None)
-            if function is not None:
-                return py.builtin._getimself(function)
+            return getattr(function, "__self__", None)
 
     @scopeproperty()
     def module(self):