diff --git a/spring-boot/src/test/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystemTests.java b/spring-boot/src/test/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystemTests.java
index bf9305b1e92..c749b30d78b 100644
--- a/spring-boot/src/test/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystemTests.java
+++ b/spring-boot/src/test/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystemTests.java
@@ -17,9 +17,13 @@
 package org.springframework.boot.logging.log4j2;
 
 import java.io.File;
+import java.util.Map.Entry;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.core.Appender;
+import org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender;
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Rule;
@@ -55,6 +59,17 @@ public class Log4J2LoggingSystemTests extends AbstractLoggingSystemTests {
 		this.logger = LogManager.getLogger(getClass());
 	}
 
+	@After
+	public void flushAllOutputStreamAppenders() {
+		for (Entry<String, Appender> entry : ((org.apache.logging.log4j.core.Logger) this.logger)
+				.getAppenders().entrySet()) {
+			Appender appender = entry.getValue();
+			if (appender instanceof AbstractOutputStreamAppender) {
+				((AbstractOutputStreamAppender<?>) appender).getManager().flush();
+			}
+		}
+	}
+
 	@Test
 	public void noFile() throws Exception {
 		this.loggingSystem.beforeInitialize();