diff --git a/lib/util.js b/lib/util.js
index 6f09dd2..f8049ad 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -228,7 +228,9 @@ exports.propCopy = function( props, dest, result_data )
                 }
                 else
                 {
-                    // todo: attempted override of property with method
+                    throw new Error(
+                        "Cannot override property '" + name + "' with method"
+                    );
                 }
 
                 if ( data.abstractModified )
diff --git a/test/test-class-extend.js b/test/test-class-extend.js
index e716c0d..7a84f75 100644
--- a/test/test-class-extend.js
+++ b/test/test-class-extend.js
@@ -126,3 +126,12 @@ assert.notEqual(
     "Subtype should contain extended members"
 );
 
+
+assert.throws( function()
+{
+    Class.extend( OtherClass,
+    {
+        foo: function() {},
+    });
+}, Error, "Cannot override property with a method" );
+