diff --git a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/HttpMessageConverters.java b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/HttpMessageConverters.java
index ef903d4806d..ac52b71fd98 100644
--- a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/HttpMessageConverters.java
+++ b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/HttpMessageConverters.java
@@ -75,15 +75,7 @@ public class HttpMessageConverters implements Iterable<HttpMessageConverter<?>>
 	public HttpMessageConverters(Collection<HttpMessageConverter<?>> additionalConverters) {
 		List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();
 		List<HttpMessageConverter<?>> defaultConverters = getDefaultConverters();
-		for (HttpMessageConverter<?> converter : additionalConverters) {
-			int defaultConverterIndex = indexOfItemClass(defaultConverters, converter);
-			if (defaultConverterIndex == -1) {
-				converters.add(converter);
-			}
-			else {
-				defaultConverters.set(defaultConverterIndex, converter);
-			}
-		}
+		converters.addAll(additionalConverters);
 		converters.addAll(defaultConverters);
 		this.converters = Collections.unmodifiableList(converters);
 	}
@@ -120,16 +112,6 @@ public class HttpMessageConverters implements Iterable<HttpMessageConverter<?>>
 		converters.addAll(xml);
 	}
 
-	private <E> int indexOfItemClass(List<E> list, E item) {
-		Class<? extends Object> itemClass = item.getClass();
-		for (int i = 0; i < list.size(); i++) {
-			if (list.get(i).getClass().isAssignableFrom(itemClass)) {
-				return i;
-			}
-		}
-		return -1;
-	}
-
 	@Override
 	public Iterator<HttpMessageConverter<?>> iterator() {
 		return getConverters().iterator();
diff --git a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/HttpMessageConvertersTests.java b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/HttpMessageConvertersTests.java
index 0d26af9144c..49ad34abf80 100644
--- a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/HttpMessageConvertersTests.java
+++ b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/HttpMessageConvertersTests.java
@@ -69,6 +69,15 @@ public class HttpMessageConvertersTests {
 		MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
 		HttpMessageConverters converters = new HttpMessageConverters(converter);
 		assertTrue(converters.getConverters().contains(converter));
+		int count = 0;
+		for (HttpMessageConverter<?> httpMessageConverter : converters) {
+			if (httpMessageConverter instanceof MappingJackson2HttpMessageConverter) {
+				count++;
+			}
+		}
+		// The existing converter is still there, but with a lower priority
+		assertEquals(2, count);
+		assertEquals(0, converters.getConverters().indexOf(converter));
 	}
 
 	@Test