diff --git a/setup.py b/setup.py
index 6a10e370..ad8befbe 100644
--- a/setup.py
+++ b/setup.py
@@ -43,6 +43,6 @@
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
-        'Topic :: Scientific/Engineering::Chemistry',
+        'Topic :: Scientific/Engineering :: Chemistry',
     ]
 )