diff --git a/lib/spack/spack/schema/modules.py b/lib/spack/spack/schema/modules.py
index 6b107d98612..0c9b14a8c58 100644
--- a/lib/spack/spack/schema/modules.py
+++ b/lib/spack/spack/schema/modules.py
@@ -78,7 +78,7 @@
             }
         }
     }
-},
+}
 
 module_type_configuration = {
     'type': 'object',