diff --git a/lib/class.js b/lib/class.js
index 59374ff..58c99d3 100644
--- a/lib/class.js
+++ b/lib/class.js
@@ -124,38 +124,6 @@ function prop_copy( props, dest, result_data )
             getter = ( ( getset ) ? props.__lookupGetter__( property ) : null ),
             setter = ( ( getset ) ? props.__lookupSetter__( property ) : null );
 
-        // did we find an abstract method?
-        if ( prop instanceof Function )
-        {
-            if ( prop.abstractFlag === true )
-            {
-                abstract_methods.push( property );
-            }
-            else
-            {
-                // if we were given a concrete method to an abstract method,
-                // then the method should no longer be considered abstract
-                if ( abstract_map[ property ] !== undefined )
-                {
-                    if ( pre.definition )
-                    {
-                        // ensure the concrete definition is compatible with
-                        // that of its supertype
-                        if ( prop.length < pre.definition.length )
-                        {
-                            throw new Error(
-                                "Declaration of " + property + " must be compatiable" +
-                                    "with that of its supertype"
-                            );
-                        }
-                    }
-
-                    delete abstract_methods[ abstract_map[ property ] ];
-                    abstract_regen = true;
-                }
-            }
-        }
-
         // check for getter/setter overrides
         if ( getter || setter )
         {
@@ -172,11 +140,32 @@ function prop_copy( props, dest, result_data )
         // check for method overrides
         else if ( ( pre !== undefined ) && ( pre instanceof Function ) )
         {
-            dest[ property ] = method_override( pre, prop );
+            var data = { abstractModified: false };
+
+            dest[ property ] = method_override(
+                pre,
+                prop,
+                property,
+                abstract_map,
+                abstract_methods,
+                data
+            );
+
+            if ( data.abstractModified )
+            {
+                abstract_regen = true;
+            }
         }
         // just copy over the property
         else
         {
+            // if we were given an abstract method, add it to our list of
+            // abstract methods
+            if ( ( prop instanceof Function ) && ( prop.abstractFlag === true ) )
+            {
+                abstract_methods.push( property );
+            }
+
             dest[ property ] = prop;
         }
     }
@@ -195,12 +184,18 @@ function prop_copy( props, dest, result_data )
  *
  * The given method must be a function or an exception will be thrown.
  *
- * @param  {Function}  super_method  method to override
- * @param  {Function}  new_method    method to override with
+ * @param  {Function}  super_method      method to override
+ * @param  {Function}  new_method        method to override with
+ * @param  {string}    name              method name
+ * @param  {Object}    abstract_map      lookup table for abstract methods
+ * @param  {Array}     abstract_methods  list of abstract methods
+ * @param  {Object}    data              object in which to store result data
  *
  * @return  {Function}  overridden method
  */
-function method_override( super_method, new_method )
+function method_override(
+    super_method, new_method, name, abstract_map, abstract_methods, data
+)
 {
     // ensure we're overriding the method with another method
     if ( !( new_method instanceof Function ) )
@@ -208,6 +203,29 @@ function method_override( super_method, new_method )
         throw new TypeError( "Cannot override method with non-method" );
     }
 
+    // if we were given a concrete method to an abstract method,
+    // then the method should no longer be considered abstract
+    if ( ( abstract_map[ name ] !== undefined )
+        && ( new_method.abstractFlag !== true )
+    )
+    {
+        if ( super_method.definition instanceof Function )
+        {
+            // ensure the concrete definition is compatible with
+            // that of its supertype
+            if ( new_method.length < super_method.definition.length )
+            {
+                throw new Error(
+                    "Declaration of " + name + " must be compatiable" +
+                        "with that of its supertype"
+                );
+            }
+        }
+
+        delete abstract_methods[ abstract_map[ name ] ];
+        data.abstractModified = true;
+    }
+
     // this is the method that will be invoked when the requested
     // method is called, so note that in the context of this
     // function, `this` will represent the current class instance