diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index c9994794373..164fe18b6fc 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -54,6 +54,10 @@
 * Fixed collection of classes with custom ``__new__`` method.
   Fixes `#1579`_. Thanks to `@Stranger6667`_ for the PR.
 
+* Fixed scope overriding inside metafunc.parametrize (`#634`_).
+  Thanks to `@Stranger6667`_ for the PR.
+
+.. _#634: https://github.com/pytest-dev/pytest/issues/634
 .. _#1579: https://github.com/pytest-dev/pytest/issues/1579
 .. _#1580: https://github.com/pytest-dev/pytest/pull/1580
 .. _#1605: https://github.com/pytest-dev/pytest/issues/1605
diff --git a/_pytest/python.py b/_pytest/python.py
index 812adf4b457..693d7c8c5d1 100644
--- a/_pytest/python.py
+++ b/_pytest/python.py
@@ -1005,9 +1005,15 @@ def parametrize(self, argnames, argvalues, indirect=False, ids=None,
             newmarks = newkeywords.setdefault(0, {})
             newmarks[newmark.markname] = newmark
 
-
         if scope is None:
-            scope = "function"
+            if self._arg2fixturedefs:
+                # Takes the most narrow scope from used fixtures
+                fixtures_scopes = [fixturedef[0].scope for fixturedef in self._arg2fixturedefs.values()]
+                for scope in reversed(scopes):
+                    if scope in fixtures_scopes:
+                        break
+            else:
+                scope = 'function'
         scopenum = scopes.index(scope)
         valtypes = {}
         for arg in argnames:
diff --git a/testing/python/metafunc.py b/testing/python/metafunc.py
index 13c70957943..d6e45384d91 100644
--- a/testing/python/metafunc.py
+++ b/testing/python/metafunc.py
@@ -819,6 +819,43 @@ def test_checklength():
         reprec = testdir.inline_run()
         reprec.assertoutcome(passed=5)
 
+    def test_parametrize_issue634(self, testdir):
+        testdir.makepyfile('''
+            import pytest
+
+            @pytest.fixture(scope='module')
+            def foo(request):
+                print('preparing foo-%d' % request.param)
+                return 'foo-%d' % request.param
+
+
+            def test_one(foo):
+                pass
+
+
+            def test_two(foo):
+                pass
+
+
+            test_two.test_with = (2, 3)
+
+
+            def pytest_generate_tests(metafunc):
+                params = (1, 2, 3, 4)
+                if not 'foo' in metafunc.fixturenames:
+                    return
+
+                test_with = getattr(metafunc.function, 'test_with', None)
+                if test_with:
+                    params = test_with
+                metafunc.parametrize('foo', params, indirect=True)
+
+        ''')
+        result = testdir.runpytest("-s")
+        output = result.stdout.str()
+        assert output.count('preparing foo-2') == 1
+        assert output.count('preparing foo-3') == 1
+
     def test_parametrize_issue323(self, testdir):
         testdir.makepyfile("""
             import pytest