diff --git a/src/main/java/com/alibaba/fastjson/parser/deserializer/FieldDeserializer.java b/src/main/java/com/alibaba/fastjson/parser/deserializer/FieldDeserializer.java
index 17c78a15b5..acf317d33d 100644
--- a/src/main/java/com/alibaba/fastjson/parser/deserializer/FieldDeserializer.java
+++ b/src/main/java/com/alibaba/fastjson/parser/deserializer/FieldDeserializer.java
@@ -139,8 +139,8 @@ public void setValue(Object object, Object value) {
 
                             if (collection == Collections.emptySet()
                                     || collection == Collections.emptyList()
-                                    || collectionClassName == "java.util.ImmutableCollections$ListN"
-                                    || collectionClassName == "java.util.ImmutableCollections$List12"
+                                    || collectionClassName.equals("java.util.ImmutableCollections$ListN")
+                                    || collectionClassName.equals("java.util.ImmutableCollections$List12")
                                     || collectionClassName.startsWith("java.util.Collections$Unmodifiable")) {
                                 // skip
                                 return;