diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
index 13b0e167532..c71d6f481b3 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
@@ -241,6 +241,12 @@ class MongoAutoConfigurationTests {
 				.doesNotHaveBean(PropertiesMongoConnectionDetails.class));
 	}
 
+	@Test
+	void uuidRepresentationDefaultsAreAligned() {
+		this.contextRunner.run((context) -> assertThat(getSettings(context).getUuidRepresentation())
+			.isEqualTo(new MongoProperties().getUuidRepresentation()));
+	}
+
 	private MongoClientSettings getSettings(AssertableApplicationContext context) {
 		assertThat(context).hasSingleBean(MongoClient.class);
 		MongoClientImpl client = (MongoClientImpl) context.getBean(MongoClient.class);
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoReactiveAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoReactiveAutoConfigurationTests.java
index df46e4b4593..1b50c5633b8 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoReactiveAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoReactiveAutoConfigurationTests.java
@@ -253,6 +253,12 @@ class MongoReactiveAutoConfigurationTests {
 				.doesNotHaveBean(PropertiesMongoConnectionDetails.class));
 	}
 
+	@Test
+	void uuidRepresentationDefaultsAreAligned() {
+		this.contextRunner.run((context) -> assertThat(getSettings(context).getUuidRepresentation())
+			.isEqualTo(new MongoProperties().getUuidRepresentation()));
+	}
+
 	private MongoClientSettings getSettings(ApplicationContext context) {
 		MongoClientImpl client = (MongoClientImpl) context.getBean(MongoClient.class);
 		return client.getSettings();