diff --git a/ServiceDefinition/Argument.php b/ServiceDefinition/Argument.php
index 87da04f..b1f8849 100644
--- a/ServiceDefinition/Argument.php
+++ b/ServiceDefinition/Argument.php
@@ -36,7 +36,7 @@ class Argument
         return $this->type;
     }
 
-    public function setType($type)
+    public function setType(Type $type)
     {
         $this->type = $type;
     }
diff --git a/ServiceDefinition/Type.php b/ServiceDefinition/Type.php
index dbf69e5..bf2c1d1 100644
--- a/ServiceDefinition/Type.php
+++ b/ServiceDefinition/Type.php
@@ -28,9 +28,9 @@ class Type
         return $this->phpType;
     }
 
-    public function setPhpType($value)
+    public function setPhpType($phpType)
     {
-        $this->phpType = $value;
+        $this->phpType = $phpType;
     }
 
     public function getXmlType()
@@ -38,9 +38,9 @@ class Type
         return $this->xmlType;
     }
 
-    public function setXmlType($value)
+    public function setXmlType($xmlType)
     {
-        $this->xmlType = $value;
+        $this->xmlType = $xmlType;
     }
 
     public function getConverter()
@@ -48,8 +48,8 @@ class Type
         return $this->converter;
     }
 
-    public function setConverter($value)
+    public function setConverter($converter)
     {
-        $this->converter = $value;
+        $this->converter = $converter;
     }
 }
\ No newline at end of file