diff --git a/setup.cfg b/setup.cfg
index 6bd1da1..08fe486 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -48,6 +48,7 @@ test =
     astroid >=2, <4; python_version >= "3"
     pytest
     pytest-xdist
+    parameterized
 
 [options.package_data]
 asttokens = py.typed
diff --git a/tests/test_mark_tokens.py b/tests/test_mark_tokens.py
index 1ba01f2..1f27623 100644
--- a/tests/test_mark_tokens.py
+++ b/tests/test_mark_tokens.py
@@ -5,13 +5,12 @@
 import inspect
 import io
 import os
+from parameterized import parameterized
 import re
 import sys
 import textwrap
 import token
-from typing import List
 import unittest
-from time import time
 
 import astroid
 import six
@@ -630,7 +629,15 @@ def test_complex_slice_and_parens(self):
     self.create_mark_checker(source)
 
   if six.PY3:
-    def test_sys_modules(self):
+    def _parameterize_sys_modules():
+      modules = list(sys.modules.keys())
+      if not os.environ.get('ASTTOKENS_SLOW_TESTS'):
+        modules = modules[:20]
+
+      return parameterized.expand([(x,) for x in modules])
+
+    @_parameterize_sys_modules()
+    def test_sys_modules(self, module_name):
       """
       Verify all nodes on source files obtained from sys.modules.
       This can take a long time as there are many modules,
@@ -639,51 +646,42 @@ def test_sys_modules(self):
       """
       from .test_astroid import AstroidTreeException
 
-      modules = list(sys.modules.values())
-      if not os.environ.get('ASTTOKENS_SLOW_TESTS'):
-        modules = modules[:20]
+      module = sys.modules[module_name]
+
+      try:
+        filename = inspect.getsourcefile(module)
+      except Exception:  # some modules raise weird errors
+        self.skipTest("Failed to get source file")
+
+      if not filename:
+        self.skipTest("No source file for module")
+
+      filename = os.path.abspath(filename)
+      print(filename)
+      try:
+        with io.open(filename) as f:
+          source = f.read()
+      except OSError:
+        self.skipTest("Error reading source file")
+
+      if self.is_astroid_test and (
+          # Astroid fails with a syntax error if a type comment is on its own line
+          re.search(r'^\s*# type: ', source, re.MULTILINE)
+      ):
+        self.skipTest("Skipping potential Astroid syntax error")
+
+      try:
+        self.create_mark_checker(source)
+      except AstroidTreeException:
+        # Astroid sometimes fails with errors like:
+        #     AttributeError: 'TreeRebuilder' object has no attribute 'visit_typealias'
+        # See https://github.com/gristlabs/asttokens/actions/runs/6015907789/job/16318767911?pr=110
+        # Should be fixed in the next astroid release:
+        #     https://github.com/pylint-dev/pylint/issues/8782#issuecomment-1669967220
+        # Note that this exception is raised before asttokens is even involved,
+        # it's purely an astroid bug that we can safely ignore.
+        self.skipTest("Skipping Astroid error")
 
-      start = time()
-      for module in modules:
-        # Don't let this test (which runs twice) take longer than 13 minutes
-        # to avoid the travis build time limit of 30 minutes
-        if time() - start > 13 * 60:
-          break
-
-        try:
-          filename = inspect.getsourcefile(module)
-        except Exception:  # some modules raise weird errors
-          continue
-
-        if not filename:
-          continue
-
-        filename = os.path.abspath(filename)
-        print(filename)
-        try:
-          with io.open(filename) as f:
-            source = f.read()
-        except OSError:
-          continue
-
-        if self.is_astroid_test and (
-            # Astroid fails with a syntax error if a type comment is on its own line
-            re.search(r'^\s*# type: ', source, re.MULTILINE)
-        ):
-          print('Skipping', filename)
-          continue
-
-        try:
-          self.create_mark_checker(source)
-        except AstroidTreeException:
-          # Astroid sometimes fails with errors like:
-          #     AttributeError: 'TreeRebuilder' object has no attribute 'visit_typealias'
-          # See https://github.com/gristlabs/asttokens/actions/runs/6015907789/job/16318767911?pr=110
-          # Should be fixed in the next astroid release:
-          #     https://github.com/pylint-dev/pylint/issues/8782#issuecomment-1669967220
-          # Note that this exception is raised before asttokens is even involved,
-          # it's purely an astroid bug that we can safely ignore.
-          continue
 
   if six.PY3:
     def test_dict_merge(self):