diff --git a/lib/Migration/Version2006Date20170808154933.php b/lib/Migration/Version2006Date20170808154933.php
index d71005d25..a0f9cb42e 100644
--- a/lib/Migration/Version2006Date20170808154933.php
+++ b/lib/Migration/Version2006Date20170808154933.php
@@ -106,7 +106,6 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
 				'default' => 0,
 			]);
 			$table->setPrimaryKey(['activity_id']);
-			$table->addIndex(['timestamp'], 'activity_time');
 			$table->addIndex(['affecteduser', 'timestamp'], 'activity_user_time');
 			$table->addIndex(['affecteduser', 'user', 'timestamp'], 'activity_filter_by');
 			// FIXME Fixed install, see Version2006Date20170808155040: $table->addIndex(['affecteduser', 'app', 'timestamp'], 'activity_filter_app');
diff --git a/lib/Migration/Version2007Date20181107114613.php b/lib/Migration/Version2007Date20181107114613.php
index a40497d8b..5fcc8c306 100644
--- a/lib/Migration/Version2007Date20181107114613.php
+++ b/lib/Migration/Version2007Date20181107114613.php
@@ -55,10 +55,6 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			]);
 		}
 
-		if (!$table->hasIndex('activity_time')) {
-			$table->addIndex(['timestamp'], 'activity_time');
-		}
-
 		if (!$table->hasIndex('activity_object')) {
 			$table->addIndex(['object_type', 'object_id'], 'activity_object');
 		}