diff --git a/include/mysql/udf_registration_types.h b/include/mysql/udf_registration_types.h
index 4ba6f9e14c3c0e5c853fd8709909fb149f958737..b67df9c009bb9f0fe0731c340bab9bb92e9c5513 100644
--- a/include/mysql/udf_registration_types.h
+++ b/include/mysql/udf_registration_types.h
@@ -42,6 +42,10 @@ enum Item_result {
   INT_RESULT,          /** long long */
   ROW_RESULT,          /** not valid for UDFs */
   DECIMAL_RESULT       /** char *, to be converted to/from a decimal */
+  /*
+    Macro cannot be added here. ABI check will be performed for this file.
+  */
+  DATETIME_RESULT      /** datetime */ /* HAVE_ZSQL_TO_DATE */
 };
 
 typedef struct UDF_ARGS {