diff --git a/pytest/_core.py b/pytest/_core.py
index 4022af993..f955c7fb5 100644
--- a/pytest/_core.py
+++ b/pytest/_core.py
@@ -115,10 +115,6 @@ class PluginManager(object):
                 self.import_plugin(opt2)
 
     def consider_conftest(self, conftestmodule):
-        cls = getattr(conftestmodule, 'ConftestPlugin', None)
-        if cls is not None:
-            raise ValueError("%r: 'ConftestPlugins' only existed till 1.0.0b1, "
-                "were removed in 1.0.0b2" % (cls,))
         if self.register(conftestmodule, name=conftestmodule.__file__):
             self.consider_module(conftestmodule)
 
diff --git a/testing/test_pluginmanager.py b/testing/test_pluginmanager.py
index 26d682dde..023b36eb1 100644
--- a/testing/test_pluginmanager.py
+++ b/testing/test_pluginmanager.py
@@ -129,11 +129,6 @@ class TestBootstrapping:
         l = reprec.getcalls("pytest_plugin_registered")
         assert len(l) == 1
 
-    def test_consider_conftest_deprecated(self, testdir):
-        pp = PluginManager()
-        mod = testdir.makepyfile("class ConftestPlugin: pass").pyimport()
-        call = py.test.raises(ValueError, pp.consider_conftest, mod)
-
     def test_config_sets_conftesthandle_onimport(self, testdir):
         config = testdir.parseconfig([])
         assert config._conftest._onimport == config._onimportconftest