diff --git a/akka-docs/rst/project/migration-guide-2.4.x-2.5.x.rst b/akka-docs/rst/project/migration-guide-2.4.x-2.5.x.rst
index 4ae7062b37..4d4e24e07f 100644
--- a/akka-docs/rst/project/migration-guide-2.4.x-2.5.x.rst
+++ b/akka-docs/rst/project/migration-guide-2.4.x-2.5.x.rst
@@ -229,7 +229,7 @@ Old::
 
 New::
 
-  object MyExtension extends extends ExtensionId[MyExtension] with ExtensionIdProvider {
+  object MyExtension extends ExtensionId[MyExtension] with ExtensionIdProvider {
 
     override def lookup = MyExtension