diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java
index e948f786c2..3308792759 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java
@@ -554,7 +554,7 @@ class LogbackLoggingSystemTests extends AbstractLoggingSystemTests {
 		initialize(loggingInitializationContext, null, null);
 		this.logger.info("Hello world");
 		assertThat(getLineWithText(output, "Hello world"))
-				.containsPattern("\\d{4}-\\d{2}\\-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}[-+]\\d{2}:\\d{2}");
+				.containsPattern("\\d{4}-\\d{2}\\-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d{3}([-+]\\d{2}:\\d{2}|Z)");
 	}
 
 	@Test