diff --git a/utils/tests/test-ns3.py b/utils/tests/test-ns3.py
index a0c2fc1a3..1349caa96 100755
--- a/utils/tests/test-ns3.py
+++ b/utils/tests/test-ns3.py
@@ -1387,10 +1387,10 @@ class NS3ConfigureTestCase(NS3BaseTestCase):
                 self.assertIn("Invalid library name: %s" % invalid_or_nonexistent_library, stderr)
             elif invalid_or_nonexistent_library in ["gsd", "libfi", "calibre"]:
                 self.assertEqual(return_code, 2)  # should fail due to missing library
-                # GCC's LD says cannot find
-                # LLVM's LLD says unable to find
                 if "lld" in stdout + stderr:
                     self.assertIn("unable to find library -l%s" % invalid_or_nonexistent_library, stderr)
+                elif "mold" in stdout + stderr:
+                    self.assertIn("library not found: %s" % invalid_or_nonexistent_library, stderr)
                 else:
                     self.assertIn("cannot find -l%s" % invalid_or_nonexistent_library, stderr)
             else: