diff --git a/includes/class-amp-theme-support.php b/includes/class-amp-theme-support.php
index 68ebafd174a..441fee9a4fd 100644
--- a/includes/class-amp-theme-support.php
+++ b/includes/class-amp-theme-support.php
@@ -996,12 +996,6 @@ public static function start_output_buffering( $args = array() ) {
 			$erase_flags = ! $args['cancelable'];
 		}
 		ob_start( array( __CLASS__, 'finish_output_buffering' ), $chunk_size, $erase_flags );
-
-		/*
-		 * Remove shutdown flushing which will cause PHP notice since buffer is not flushable.
-		 * This was only needed in PHP 5.2 anyway, which this plugin does not support.
-		 */
-		remove_action( 'shutdown', 'wp_ob_end_flush_all', 1 );
 	}
 
 	/**