diff --git a/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/RestartScopeInitializer.java b/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/RestartScopeInitializer.java
index f03bbc4b598..8fc700b32da 100644
--- a/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/RestartScopeInitializer.java
+++ b/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/RestartScopeInitializer.java
@@ -47,7 +47,7 @@ public class RestartScopeInitializer implements ApplicationContextInitializer<Co
 		}
 
 		@Override
-		public Object remove(String name) {
+		public @Nullable Object remove(String name) {
 			return Restarter.getInstance().removeAttribute(name);
 		}
 
diff --git a/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/Restarter.java b/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/Restarter.java
index ae205b0c2fd..8727c0ace9e 100644
--- a/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/Restarter.java
+++ b/module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/Restarter.java
@@ -450,7 +450,7 @@ public class Restarter {
 		return value;
 	}
 
-	public Object removeAttribute(String name) {
+	public @Nullable Object removeAttribute(String name) {
 		return this.attributes.remove(name);
 	}
 
diff --git a/module/spring-boot-webmvc-test/src/main/java/org/springframework/boot/webmvc/test/autoconfigure/WebDriverScope.java b/module/spring-boot-webmvc-test/src/main/java/org/springframework/boot/webmvc/test/autoconfigure/WebDriverScope.java
index cd901936987..44714aef4c3 100644
--- a/module/spring-boot-webmvc-test/src/main/java/org/springframework/boot/webmvc/test/autoconfigure/WebDriverScope.java
+++ b/module/spring-boot-webmvc-test/src/main/java/org/springframework/boot/webmvc/test/autoconfigure/WebDriverScope.java
@@ -68,7 +68,7 @@ public class WebDriverScope implements Scope {
 	}
 
 	@Override
-	public Object remove(String name) {
+	public @Nullable Object remove(String name) {
 		synchronized (this.instances) {
 			return this.instances.remove(name);
 		}