diff --git a/module/spring-boot-jackson/src/main/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfiguration.java b/module/spring-boot-jackson/src/main/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfiguration.java
index 8371031547d4..d0781af87c63 100644
--- a/module/spring-boot-jackson/src/main/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfiguration.java
+++ b/module/spring-boot-jackson/src/main/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfiguration.java
@@ -66,6 +66,7 @@
 import org.springframework.core.Ordered;
 import org.springframework.http.ProblemDetail;
 import org.springframework.http.converter.json.ProblemDetailJacksonMixin;
+import org.springframework.http.converter.json.ProblemDetailJacksonXmlMixin;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.ReflectionUtils;
@@ -282,7 +283,7 @@ static final class ProblemDetailXmlMapperBuilderCustomizer implements XmlMapperB
 
 				@Override
 				public void customize(XmlMapper.Builder builder) {
-					builder.addMixIn(ProblemDetail.class, ProblemDetailJacksonMixin.class);
+					builder.addMixIn(ProblemDetail.class, ProblemDetailJacksonXmlMixin.class);
 				}
 
 			}
diff --git a/module/spring-boot-jackson/src/test/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfigurationTests.java b/module/spring-boot-jackson/src/test/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfigurationTests.java
index 37c811cdb5bc..2101a96a4d04 100644
--- a/module/spring-boot-jackson/src/test/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfigurationTests.java
+++ b/module/spring-boot-jackson/src/test/java/org/springframework/boot/jackson/autoconfigure/JacksonAutoConfigurationTests.java
@@ -691,7 +691,7 @@ void shouldRegisterProblemDetailsMixinWithXmlMapper() {
 			problemDetail.setProperty("spring", "boot");
 			String xml = mapper.writeValueAsString(problemDetail);
 			assertThat(xml).isEqualTo(
-					"<ProblemDetail><status>404</status><title>Not Found</title><spring>boot</spring></ProblemDetail>");
+					"<problem xmlns=\"urn:ietf:rfc:7807\"><status>404</status><title>Not Found</title><spring>boot</spring></problem>");
 		});
 	}