diff --git a/core/Object.php b/core/Object.php
index bd4d31ee0..c16f1efd2 100755
--- a/core/Object.php
+++ b/core/Object.php
@@ -426,12 +426,6 @@ abstract class Object {
 	public static function has_extension($requiredExtension) {
 		$class = get_called_class();
 
-		if(func_num_args() > 1) {
-			Deprecation::notice('3.2.0', "Object::has_extension() deprecated. Call has_extension() on the class");
-			$class = func_get_arg(0);
-			$requiredExtension = func_get_arg(1);
-		}
-
 		$requiredExtension = strtolower($requiredExtension);
 		$extensions = Config::inst()->get($class, 'extensions');
 
@@ -459,12 +453,6 @@ abstract class Object {
 	public static function add_extension($extension) {
 		$class = get_called_class();
 
-		if(func_num_args() > 1) {
-			Deprecation::notice('3.2.0', "Object::add_extension() deprecated. Call add_extension() on the class");
-			$class = func_get_arg(0);
-			$extension = func_get_arg(1);
-		}
-
 		if(!preg_match('/^([^(]*)/', $extension, $matches)) {
 			return false;
 		}
@@ -520,12 +508,6 @@ abstract class Object {
 	public static function remove_extension($extension) {
 		$class = get_called_class();
 
-		if(func_num_args() > 1) {
-			Deprecation::notice('3.2.0', "Object::remove_extension() deprecated. Call remove_extension() on the class");
-			$class = func_get_arg(0);
-			$extension = func_get_arg(1);
-		}
-
 		Config::inst()->remove($class, 'extensions', Config::anything(), $extension);
 		Config::inst()->extraConfigSourcesChanged($class);
 
diff --git a/docs/en/changelogs/3.1.0.md b/docs/en/changelogs/3.1.0.md
index c41938a44..e760b0448 100644
--- a/docs/en/changelogs/3.1.0.md
+++ b/docs/en/changelogs/3.1.0.md
@@ -342,7 +342,6 @@ you can enable those warnings and future-proof your code already.
 
  * `TableListField`, `ComplexTableField`, `TableField`, `HasOneComplexTableField`, `HasManyComplexTableField` and `ManyManyComplexTableField` have been removed from the core and placed into a module called "legacytablefields" located at https://github.com/silverstripe-labs/legacytablefields
  * `prototype.js` and `behaviour.js` have been removed from the core, they are no longer used. If you have custom code relying on these two libraries, please update your code to include the files yourself
- * `Object::has_extension()` and `Object::add_extension()` deprecated in favour of using late static binding, please use `{class}::has_extension()` and `{class}::add_extension()` instead, where {class} is the class name of your DataObject class.
  * Removed `SiteTree.MetaKeywords` since they are irrelevant in terms of SEO ([seomoz article](http://www.mattcutts.com/blog/keywords-meta-tag-in-web-search/)) and general page informancy
  * Removed `SiteTree.MetaTitle` as a means to customize the window title, use `SiteTree.Title` instead
  * Deprecated `Profiler` class, use third-party solutions like [xhprof](https://github.com/facebook/xhprof/)