1 files changed, 1 insertions, 1 deletions
diff --git a/sql/item_func.h b/sql/item_func.h
index 10464a408a7..1661e1a10de 100644
--- a/sql/item_func.h
+++ b/sql/item_func.h
@@ -333,8 +333,8 @@ class Item_decimal_typecast :public Item_func
 public:
   Item_decimal_typecast(Item *a, int len, int dec) :Item_func(a)
   {
-    max_length= len + 2;
     decimals= dec;
+    max_length= my_decimal_precision_to_length(len, dec, unsigned_flag);
   }
   String *val_str(String *str);
   double val_real();