diff --git a/test/helpers.py b/test/helpers.py
index 5eee1d29..db1c839d 100644
--- a/test/helpers.py
+++ b/test/helpers.py
@@ -156,16 +156,6 @@ def skip_windows(message="This test is not supported on Windows"):
     return wrapper
 
 
-def slow_test(f):
-    @functools.wraps(f)
-    def wrapper(*args, **kwargs):
-        if ('CI' in os.environ and 'RUN_SLOW' not in os.environ and
-                os.environ.get('TRAVIS_EVENT_TYPE') != 'cron'):
-            raise unittest.SkipTest("Slow test skipped on CI run")
-        return f(*args, **kwargs)
-    return wrapper
-
-
 @lru_cache(maxsize=None)
 def ensure_available(executable):
     """
diff --git a/test/test_functest.py b/test/test_functest.py
index 53171217..8249e6cd 100644
--- a/test/test_functest.py
+++ b/test/test_functest.py
@@ -50,7 +50,6 @@ def test_functest(implementation, impl_path, test_dir,
 )
 @helpers.skip_windows()
 @helpers.filtered_test
-@helpers.slow_test
 def test_functest_sanitizers(implementation, impl_path, test_dir,
                              init, destr):
     dest_dir = os.path.join(test_dir, 'bin')
diff --git a/test/test_valgrind.py b/test/test_valgrind.py
index 32715b41..061758be 100644
--- a/test/test_valgrind.py
+++ b/test/test_valgrind.py
@@ -30,7 +30,6 @@ def valgrind_supports_exit_early():
      for impl in pqclean.Scheme.all_supported_implementations()],
     ids=[str(impl) for impl in pqclean.Scheme.all_supported_implementations()],
 )
-@helpers.slow_test
 @helpers.filtered_test
 def test_valgrind(implementation: pqclean.Implementation, impl_path, test_dir,
                   init, destr):