diff --git a/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java b/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java
index d6f5b49f6c..19b22fef2c 100644
--- a/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java
+++ b/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java
@@ -357,7 +357,9 @@ public abstract class AbstractJackson2HttpMessageConverter extends AbstractGener
 		ObjectMapper objectMapper = selectObjectMapper(javaType.getRawClass(), contentType);
 		Assert.state(objectMapper != null, "No ObjectMapper for " + javaType);
 
-		boolean isUnicode = ENCODINGS.containsKey(charset.name());
+		boolean isUnicode = ENCODINGS.containsKey(charset.name()) ||
+				"UTF-16".equals(charset.name()) ||
+				"UTF-32".equals(charset.name());
 		try {
 			if (inputMessage instanceof MappingJacksonInputMessage) {
 				Class<?> deserializationView = ((MappingJacksonInputMessage) inputMessage).getDeserializationView();