diff --git a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpoint.java b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpoint.java
index f1545096eb56..00df14059d48 100644
--- a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpoint.java
+++ b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpoint.java
@@ -41,6 +41,7 @@
 import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;
 import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;
 import com.fasterxml.jackson.databind.json.JsonMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
 import com.fasterxml.jackson.databind.ser.BeanSerializerFactory;
 import com.fasterxml.jackson.databind.ser.BeanSerializerModifier;
@@ -48,6 +49,7 @@
 import com.fasterxml.jackson.databind.ser.SerializerFactory;
 import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
 import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -80,6 +82,7 @@
 import org.springframework.core.env.PropertySource;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.StringUtils;
+import org.springframework.util.unit.DataSize;
 
 /**
  * {@link Endpoint @Endpoint} to expose application properties from
@@ -188,12 +191,12 @@ protected void configureJsonMapper(JsonMapper.Builder builder) {
 		builder.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
 		builder.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
 		builder.configure(SerializationFeature.WRITE_DURATIONS_AS_TIMESTAMPS, false);
-		JsonMapper.builder();
 		builder.configure(MapperFeature.USE_STD_BEAN_NAMING, true);
 		builder.serializationInclusion(Include.NON_NULL);
 		applyConfigurationPropertiesFilter(builder);
 		applySerializationModifier(builder);
 		builder.addModule(new JavaTimeModule());
+		builder.addModule(new ConfigurationPropertiesModule());
 	}
 
 	private void applyConfigurationPropertiesFilter(JsonMapper.Builder builder) {
@@ -474,6 +477,17 @@ public void serializeAsField(Object pojo, JsonGenerator jgen, SerializerProvider
 
 	}
 
+	/**
+	 * {@link SimpleModule} for configure the serializer.
+	 */
+	private static final class ConfigurationPropertiesModule extends SimpleModule {
+
+		private ConfigurationPropertiesModule() {
+			addSerializer(DataSize.class, ToStringSerializer.instance);
+		}
+
+	}
+
 	/**
 	 * {@link BeanSerializerModifier} to return only relevant configuration properties.
 	 */
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointTests.java
index cc424053b4b8..32cbf8ea5809 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointTests.java
@@ -46,6 +46,7 @@
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
 import org.springframework.mock.env.MockPropertySource;
+import org.springframework.util.unit.DataSize;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.entry;
@@ -168,6 +169,19 @@ void descriptorWithMixedBooleanProperty() {
 				(properties) -> assertThat(properties.get("mixedBoolean")).isEqualTo(true)));
 	}
 
+	@Test
+	void descriptorWithDataSizeProperty() {
+		String configSize = "1MB";
+		String stringifySize = DataSize.parse(configSize).toString();
+		this.contextRunner.withUserConfiguration(DataSizePropertiesConfiguration.class)
+				.withPropertyValues(String.format("data.size=%s", configSize)).run(assertProperties("data",
+						(properties) -> assertThat(properties.get("size")).isEqualTo(stringifySize), (inputs) -> {
+							Map<String, Object> size = (Map<String, Object>) inputs.get("size");
+							assertThat(size.get("value")).isEqualTo(configSize);
+							assertThat(size.get("origin")).isEqualTo("\"data.size\" from property source \"test\"");
+						}));
+	}
+
 	@Test
 	void sanitizeWithDefaultSettings() {
 		this.contextRunner.withUserConfiguration(TestPropertiesConfiguration.class)
@@ -690,6 +704,27 @@ public void setMixedBoolean(Boolean mixedBoolean) {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	@EnableConfigurationProperties(DataSizeProperties.class)
+	static class DataSizePropertiesConfiguration {
+
+	}
+
+	@ConfigurationProperties("data")
+	public static class DataSizeProperties {
+
+		private DataSize size;
+
+		public DataSize getSize() {
+			return this.size;
+		}
+
+		public void setSize(DataSize size) {
+			this.size = size;
+		}
+
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	@EnableConfigurationProperties(Gh4415Properties.class)
 	static class Gh4415PropertiesConfiguration {