diff --git a/spring-web/src/main/java/org/springframework/http/converter/json/Jackson2ObjectMapperBuilder.java b/spring-web/src/main/java/org/springframework/http/converter/json/Jackson2ObjectMapperBuilder.java
index cc0ff5fafc..a083fb8562 100644
--- a/spring-web/src/main/java/org/springframework/http/converter/json/Jackson2ObjectMapperBuilder.java
+++ b/spring-web/src/main/java/org/springframework/http/converter/json/Jackson2ObjectMapperBuilder.java
@@ -677,7 +677,7 @@ public class Jackson2ObjectMapperBuilder {
 			objectMapper.setFilterProvider(this.filters);
 		}
 
-		this.mixIns.forEach((target, mixinSource) -> objectMapper.addMixIn(target, mixinSource));
+		this.mixIns.forEach(objectMapper::addMixIn);
 
 		if (!this.serializers.isEmpty() || !this.deserializers.isEmpty()) {
 			SimpleModule module = new SimpleModule();