diff --git a/manifests/virtualenv.pp b/manifests/virtualenv.pp
index ad3910ad..0599b987 100644
--- a/manifests/virtualenv.pp
+++ b/manifests/virtualenv.pp
@@ -49,7 +49,7 @@
   Integer                               $timeout         = 1800,
   String                                $pip_args        = '',
   String                                $extra_pip_args  = '',
-  Optional[Stdlib::Absolutepath]        $virtualenv      = undef,
+  Optional[String[1]]                   $virtualenv      = undef,
 ) {
   include python