diff --git a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SpringBootWebSecurityConfiguration.java b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SpringBootWebSecurityConfiguration.java
index de9a3f7ee4f..22747e1ad7e 100644
--- a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SpringBootWebSecurityConfiguration.java
+++ b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SpringBootWebSecurityConfiguration.java
@@ -100,8 +100,8 @@ public class SpringBootWebSecurityConfiguration {
 	public static void configureHeaders(HeadersConfigurer<?> configurer,
 			SecurityProperties.Headers headers) throws Exception {
 		if (headers.getHsts() != Headers.HSTS.NONE) {
-			boolean includeSubdomains = headers.getHsts() == Headers.HSTS.ALL;
-			HstsHeaderWriter writer = new HstsHeaderWriter(includeSubdomains);
+			boolean includeSubDomains = headers.getHsts() == Headers.HSTS.ALL;
+			HstsHeaderWriter writer = new HstsHeaderWriter(includeSubDomains);
 			writer.setRequestMatcher(AnyRequestMatcher.INSTANCE);
 			configurer.addHeaderWriter(writer);
 		}