diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java
index 527849b619..9ab60a620d 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java
@@ -473,7 +473,7 @@ public class ServerProperties {
 		/**
 		 * Whether to reject requests with illegal header names or values.
 		 */
-		@Deprecated
+		@Deprecated(since = "2.7.12", forRemoval = true)
 		private boolean rejectIllegalHeader = true;
 
 		/**