diff --git a/frappe/core/doctype/doctype/doctype.py b/frappe/core/doctype/doctype/doctype.py
index b45855d186..1190e85ca5 100644
--- a/frappe/core/doctype/doctype/doctype.py
+++ b/frappe/core/doctype/doctype/doctype.py
@@ -182,6 +182,8 @@ class DocType(Document):
 					else:
 						d.fieldname = d.fieldtype.lower().replace(" ","_") + "_" + str(d.idx)
 
+				d.fieldname = re.sub('''['",./%@()<>{}]''', '', d.fieldname)
+
 				# fieldnames should be lowercase
 				d.fieldname = d.fieldname.lower()