diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServerFactoryDelegate.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServerFactoryDelegate.java
index 31f1e59b6c..c9bfa76145 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServerFactoryDelegate.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServerFactoryDelegate.java
@@ -189,8 +189,8 @@ class UndertowWebServerFactoryDelegate {
 
 	static List<HttpHandlerFactory> createHttpHandlerFactories(Compression compression, boolean useForwardHeaders,
 			String serverHeader, Shutdown shutdown, HttpHandlerFactory... initialHttpHandlerFactories) {
-		List<HttpHandlerFactory> factories = new ArrayList<HttpHandlerFactory>();
-		factories.addAll(Arrays.asList(initialHttpHandlerFactories));
+		List<HttpHandlerFactory> factories =
+				new ArrayList<HttpHandlerFactory>(Arrays.asList(initialHttpHandlerFactories));
 		if (compression != null && compression.getEnabled()) {
 			factories.add(new CompressionHttpHandlerFactory(compression));
 		}