diff --git a/src/test/java/com/fasterxml/jackson/databind/deser/CustomDeserializers4225NullCacheTest.java b/src/test/java/com/fasterxml/jackson/databind/deser/CustomDeserializers4225NullCacheTest.java
index 62cf951728..09be097f96 100644
--- a/src/test/java/com/fasterxml/jackson/databind/deser/CustomDeserializers4225NullCacheTest.java
+++ b/src/test/java/com/fasterxml/jackson/databind/deser/CustomDeserializers4225NullCacheTest.java
@@ -54,7 +54,7 @@ static class Bean4225 {
     @Test
     public void testGetNullValueIsCached() throws Exception
     {
-        ObjectMapper mapper = objectMapper();
+        ObjectMapper mapper = newJsonMapper();
 
         // First time deserializing null
         verifyGetNullValueInvokedTimes(mapper, 1);