diff --git a/CHANGES.md b/CHANGES.md
index d33107a..2194739 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,7 @@ Poodinis Changelog
 should not be affected by this change.
 * ADD application contexts. You can register dependencies within an application context which allow you to fine-tune the creation of dependency instances.
 * CHANGE all public poodinis imports to private. This should not affect you if you use the package import "poodinis" instead of individual modules.
+* REMOVE deprecated ADD_CONCRETE_TYPE_REGISTRATION registration option.
 
 **Version 5.0.0**
 * DEPRECATE ADD_CONCRETE_TYPE_REGISTRATION registration option. It basically does nothing anymore. See next point.
diff --git a/source/poodinis/container.d b/source/poodinis/container.d
index 49651a7..8d050d3 100644
--- a/source/poodinis/container.d
+++ b/source/poodinis/container.d
@@ -47,30 +47,6 @@ class RegistrationException : Exception {
  * Options which influence the process of registering dependencies
  */
 public enum RegistrationOption {
-	/**
-	 * When registering a type by its supertype, providing this option will also register
-	 * a linked registration to the type itself.
-	 *
-	 * This allows you to resolve that type both by super type and concrete type using the
-	 * same registration scope (and instance managed by this scope).
-	 *
-	 * Examples:
-	 * ---
-	 * class Cat : Animal { ... }
-	 *
-	 * container.register!(Animal, Cat)(RegistrationOptions.ADD_CONCRETE_TYPE_REGISTRATION);
-	 *
-	 * auto firstCat = container.resolve!(Animal, Cat);
-	 * auto secondCat = container.resolve!Cat;
-	 *
-	 * assert(firstCat is secondCat);
-	 * ---
-	 *
-	 * Deprecated: ADD_CONCRETE_TYPE_REGISTRATION behaviour is default now. If you want to reverse to happen, use DO_NOT_ADD_CONCRETE_TYPE_REGISTRATION.
-	 */
-
-	ADD_CONCRETE_TYPE_REGISTRATION,
-
 	/**
 	 * Prevent a concrete type being registered on itself. With this option you will always need
 	 * to use the supertype as the type of the dependency.
diff --git a/test/poodinis/containertest.d b/test/poodinis/containertest.d
index 67d7e52..663777b 100644
--- a/test/poodinis/containertest.d
+++ b/test/poodinis/containertest.d
@@ -494,17 +494,6 @@ version(unittest) {
 		assert(expectedTestClass is actualTestClass, "Instance resolved in main thread is not the one resolved in thread");
 	}
 
-	// Test registering type with option ADD_CONCRETE_TYPE_REGISTRATION
-	unittest {
-		shared(DependencyContainer) container = new DependencyContainer();
-		container.register!(TestInterface, TestClass)(RegistrationOption.ADD_CONCRETE_TYPE_REGISTRATION);
-
-		auto firstInstance = container.resolve!TestInterface;
-		auto secondInstance = container.resolve!TestClass;
-
-		assert(firstInstance is secondInstance);
-	}
-
 	// Test registering type with option DO_NOT_ADD_CONCRETE_TYPE_REGISTRATION
 	unittest {
 		shared(DependencyContainer) container = new DependencyContainer();