diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/LoggingSystem.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/LoggingSystem.java
index d906e29336..403c18d0ec 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/LoggingSystem.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/LoggingSystem.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -60,7 +60,8 @@ public abstract class LoggingSystem {
 
 	static {
 		Map<String, String> systems = new LinkedHashMap<>();
-		systems.put("ch.qos.logback.core.Appender", "org.springframework.boot.logging.logback.LogbackLoggingSystem");
+		systems.put("ch.qos.logback.classic.LoggerContext",
+				"org.springframework.boot.logging.logback.LogbackLoggingSystem");
 		systems.put("org.apache.logging.log4j.core.impl.Log4jContextFactory",
 				"org.springframework.boot.logging.log4j2.Log4J2LoggingSystem");
 		systems.put("java.util.logging.LogManager", "org.springframework.boot.logging.java.JavaLoggingSystem");