diff --git a/manifests/install.pp b/manifests/install.pp
index 243e6a23..b0b63d21 100644
--- a/manifests/install.pp
+++ b/manifests/install.pp
@@ -18,7 +18,7 @@
   $python = $::python::version ? {
     'system' => 'python',
     'pypy'   => 'pypy',
-    default  => "${python::version}",
+    default  => $python::version,
   }
 
   $pythondev = $::osfamily ? {