diff --git a/lib/class_builder.js b/lib/class_builder.js
index f06b299..8548ae3 100644
--- a/lib/class_builder.js
+++ b/lib/class_builder.js
@@ -268,19 +268,21 @@ function createConcreteCtor( cname, members )
 {
     var args = null;
 
-    // constructor function to be returned
-    var __self = function()
+    // constructor function to be returned (the name is set to ClassInstance
+    // because some debuggers (e.g. v8) will show the name of this function for
+    // constructor instances rather than invoking the toString() method)
+    var ClassInstance = function ClassInstance()
     {
-        if ( !( this instanceof __self ) )
+        if ( !( this instanceof ClassInstance ) )
         {
             // store arguments to be passed to constructor and
             // instantiate new object
             args = arguments;
-            return new __self();
+            return new ClassInstance();
         }
 
         // generate and store unique instance id
-        attachInstanceId( this, ++instance_id, __self );
+        attachInstanceId( this, ++instance_id, ClassInstance );
 
         initInstance( instance_id, this );
         this.__initProps();
@@ -324,12 +326,12 @@ function createConcreteCtor( cname, members )
     };
 
     // provide a more intuitive string representation
-    __self.toString = ( cname )
+    ClassInstance.toString = ( cname )
         ? function() { return cname; }
         : function() { return '(Class)'; }
     ;
 
-    return __self;
+    return ClassInstance;
 }