diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/embedded/UndertowWebServerFactoryCustomizerTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/embedded/UndertowWebServerFactoryCustomizerTests.java
index f284ea25a26b..da9c51eeb52c 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/embedded/UndertowWebServerFactoryCustomizerTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/embedded/UndertowWebServerFactoryCustomizerTests.java
@@ -101,6 +101,7 @@ public void customMaxHttpHeaderSizeIgnoredIfNegative() {
 		assertThat(boundServerOption(UndertowOptions.MAX_HEADER_SIZE)).isNull();
 	}
 
+	@Test
 	public void customMaxHttpHeaderSizeIgnoredIfZero() {
 		bind("server.max-http-header-size=0");
 		assertThat(boundServerOption(UndertowOptions.MAX_HEADER_SIZE)).isNull();