diff --git a/frappe/model/db_schema.py b/frappe/model/db_schema.py
index 9f6a38e4ca..d71bff45a4 100644
--- a/frappe/model/db_schema.py
+++ b/frappe/model/db_schema.py
@@ -575,7 +575,7 @@ def get_definition(fieldtype, precision=None, length=None):
 
 	if size:
 		if fieldtype in ["Float", "Currency", "Percent"] and cint(precision) > 6:
-			size = '18,9'
+			size = '21,9'
 
 		if coltype == "varchar" and length:
 			size = length