diff --git a/packages/thapi/package.py b/packages/thapi/package.py
index 1a4335b..7e3e28e 100644
--- a/packages/thapi/package.py
+++ b/packages/thapi/package.py
@@ -47,7 +47,7 @@ class Thapi(AutotoolsPackage):
     variant('strict', default=False, description='Enable -Werror during the build')
     variant('mpi', default=False, description='MPI will be used in the Sync Daemon')
     with when("+mpi"):
-        depends_on('mpi', type=('build','run'))
+        depends_on('mpi', type=('build', 'run'))
     def configure_args(self):
         args = []
         args.extend(self.enable_or_disable('strict'))