diff --git a/spring-boot/src/main/java/org/springframework/boot/context/embedded/undertow/UndertowEmbeddedServletContainerFactory.java b/spring-boot/src/main/java/org/springframework/boot/context/embedded/undertow/UndertowEmbeddedServletContainerFactory.java
index 254c4324950..689bbaf880b 100644
--- a/spring-boot/src/main/java/org/springframework/boot/context/embedded/undertow/UndertowEmbeddedServletContainerFactory.java
+++ b/spring-boot/src/main/java/org/springframework/boot/context/embedded/undertow/UndertowEmbeddedServletContainerFactory.java
@@ -300,9 +300,8 @@ public class UndertowEmbeddedServletContainerFactory
 			KeyManagerFactory keyManagerFactory = KeyManagerFactory
 					.getInstance(KeyManagerFactory.getDefaultAlgorithm());
 			Ssl ssl = getSsl();
-			char[] keyPassword = ssl.getKeyPassword() != null
-				? ssl.getKeyPassword().toCharArray()
-				: null;
+			char[] keyPassword = (ssl.getKeyPassword() != null
+					? ssl.getKeyPassword().toCharArray() : null);
 			if (keyPassword == null && ssl.getKeyStorePassword() != null) {
 				keyPassword = ssl.getKeyStorePassword().toCharArray();
 			}