diff --git a/features/encrypt/core/src/main/java/org/apache/shardingsphere/encrypt/rewrite/token/pojo/EncryptFunctionAssignmentToken.java b/features/encrypt/core/src/main/java/org/apache/shardingsphere/encrypt/rewrite/token/pojo/EncryptFunctionAssignmentToken.java
index 3ce26ec682142..ba51b0907f716 100644
--- a/features/encrypt/core/src/main/java/org/apache/shardingsphere/encrypt/rewrite/token/pojo/EncryptFunctionAssignmentToken.java
+++ b/features/encrypt/core/src/main/java/org/apache/shardingsphere/encrypt/rewrite/token/pojo/EncryptFunctionAssignmentToken.java
@@ -70,11 +70,7 @@ private static final class FunctionAssignment {
         
         @Override
         public String toString() {
-            return String.format("%s = %s", columnName, toString(value));
-        }
-        
-        private String toString(final Object value) {
-            return String.class == value.getClass() ? String.format("%s", value) : value.toString();
+            return String.format("%s = %s", columnName, value);
         }
     }
 }