diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/DeferredLog.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/DeferredLog.java
index cf5f7b4713..05026a362d 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/DeferredLog.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/DeferredLog.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,7 +35,7 @@ import org.springframework.util.Assert;
  */
 public class DeferredLog implements Log {
 
-	private volatile Log destination;
+	private Log destination;
 
 	private final Supplier<Log> destinationSupplier;
 
@@ -175,7 +175,9 @@ public class DeferredLog implements Log {
 	}
 
 	void switchOver() {
-		this.destination = this.destinationSupplier.get();
+		synchronized (this.lines) {
+			this.destination = this.destinationSupplier.get();
+		}
 	}
 
 	/**