diff --git a/tests/test_tools.py b/tests/test_tools.py
index c79fe97b925bb3811f53b22b98546672adead76f..d2a7325f9ef2552df1295987d02bc5d616d16d1b 100644
--- a/tests/test_tools.py
+++ b/tests/test_tools.py
@@ -536,5 +536,5 @@ class TestIsCC(unittest.TestCase):
         NC_file = is_CC(GENHEN_OFFLINE_FILE)
         CC_file = is_CC(GSEAGEN_OFFLINE_FILE)
 
-        # self.assertFalse(all(NC_file) == True)  # this test fails because the CC flags are not reliable in old files
+        self.assertFalse(all(NC_file) == True)  # this test fails because the CC flags are not reliable in old files
         self.assertTrue(all(CC_file) == True)