diff --git a/setup.cfg b/setup.cfg
index 56b222f..0af5d45 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,13 +13,13 @@ project_urls =
     Bug Reports = https://github.com/spacetelescope/wfc3tools/issues/
     Source = https://github.com/spacetelescope/wfc3tools/
     Help = https://hsthelp.stsci.edu
-classifiers=
-    'Intended Audience :: Science/Research',
-    'License :: OSI Approved :: BSD License',
-    'Operating System :: OS Independent',
-    'Programming Language :: Python',
-    'Topic :: Scientific/Engineering :: Astronomy',
-    'Topic :: Software Development :: Libraries :: Python Modules'
+classifier=
+    Intended Audience :: Science/Research
+    License :: OSI Approved :: BSD License
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Topic :: Scientific/Engineering :: Astronomy
+    Topic :: Software Development :: Libraries :: Python Modules
 
 [options]
 packages = find: