diff --git a/lib/ClassBuilder.js b/lib/ClassBuilder.js
index a31d935..f8335e7 100644
--- a/lib/ClassBuilder.js
+++ b/lib/ClassBuilder.js
@@ -55,7 +55,10 @@ var util    = require( __dirname + '/util' ),
      *
      * @type {Object.<string,boolean>}
      */
-    reserved_members = { '__initProps': true },
+    reserved_members = {
+        '__initProps': true,
+        'constructor': true,
+    },
 
     /**
      * Hash of methods that must be public
diff --git a/test/test-class_builder-member-restrictions.js b/test/test-class_builder-member-restrictions.js
index 2411058..1b7c3c5 100644
--- a/test/test-class_builder-member-restrictions.js
+++ b/test/test-class_builder-member-restrictions.js
@@ -75,6 +75,36 @@ var common  = require( './common' ),
 } )();
 
 
+/**
+ * This test is to ensure that nobody (a) removes reserved members without
+ * understanding the consequences or (b) adds reserved members without properly
+ * documenting them.
+ */
+( function testProperMembersAreReserved()
+{
+    var chk      = [ '__initProps', 'constructor' ],
+        i        = chk.length,
+        reserved = ClassBuilder.getReservedMembers();
+
+    while ( i-- )
+    {
+        var cur = chk[ i ];
+
+        assert.ok( reserved.hasOwnProperty( cur ),
+            "Member '" + cur + "' should be reserved"
+        );
+
+        delete reserved[ cur ];
+    }
+
+    // ensure there are no others that we didn't expect
+    for ( var name in reserved )
+    {
+        assert.fail( "Untested reserved member found: " + name );
+    }
+} )();
+
+
 /**
  * Ensure that each of the reserved members will throw an exception if they are
  * used.