diff --git a/REFERENCE.md b/REFERENCE.md
index f3a382e5..d690f047 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -982,7 +982,7 @@ Default value: `['/bin', '/usr/bin', '/usr/sbin', '/usr/local/bin',]`
 
 ##### <a name="-python--pyvenv--environment"></a>`environment`
 
-Data type: `Array`
+Data type: `Array[String[1]]`
 
 Optionally specify environment variables for pyvenv
 
diff --git a/manifests/pyvenv.pp b/manifests/pyvenv.pp
index 5bfc2103..33b37100 100644
--- a/manifests/pyvenv.pp
+++ b/manifests/pyvenv.pp
@@ -32,7 +32,7 @@
   String[1]                   $group       = 'root',
   Stdlib::Filemode            $mode        = '0755',
   Array[Stdlib::Absolutepath] $path        = ['/bin', '/usr/bin', '/usr/sbin', '/usr/local/bin',],
-  Array                       $environment = [],
+  Array[String[1]]            $environment = [],
   Optional[String[1]]         $prompt      = undef,
   Python::Venv::PipVersion    $pip_version = 'latest',
   Optional[Stdlib::Absolutepath] $python_path = undef,