diff --git a/scope.go b/scope.go
index cd6b235d..104a3728 100644
--- a/scope.go
+++ b/scope.go
@@ -3,6 +3,7 @@ package gorm
 import (
 	"errors"
 	"fmt"
+	"regexp"
 	"strings"
 	"time"
 
@@ -87,6 +88,13 @@ func (scope *Scope) Quote(str string) string {
 	}
 }
 
+func (scope *Scope) QuoteIfPossible(str string) string {
+	if regexp.MustCompile("^[a-zA-Z]+(.[a-zA-Z]+)*$").MatchString(str) {
+		return scope.Quote(str)
+	}
+	return str
+}
+
 // Dialect get dialect
 func (scope *Scope) Dialect() Dialect {
 	return scope.db.parent.dialect
diff --git a/scope_private.go b/scope_private.go
index e440f7a4..e22a726a 100644
--- a/scope_private.go
+++ b/scope_private.go
@@ -531,11 +531,7 @@ func (scope *Scope) addIndex(unique bool, indexName string, column ...string) {
 
 	var columns []string
 	for _, name := range column {
-		if regexp.MustCompile("^[a-zA-Z]+$").MatchString(name) {
-			columns = append(columns, scope.Quote(name))
-		} else {
-			columns = append(columns, name)
-		}
+		columns = append(columns, scope.QuoteIfPossible(name))
 	}
 
 	sqlCreate := "CREATE INDEX"
@@ -550,7 +546,7 @@ func (scope *Scope) addForeignKey(field string, dest string, onDelete string, on
 	var table = scope.TableName()
 	var keyName = fmt.Sprintf("%s_%s_foreign", table, field)
 	var query = `ALTER TABLE %s ADD CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s ON DELETE %s ON UPDATE %s;`
-	scope.Raw(fmt.Sprintf(query, scope.QuotedTableName(), scope.Quote(keyName), scope.Quote(field), scope.Quote(dest), onDelete, onUpdate)).Exec()
+	scope.Raw(fmt.Sprintf(query, scope.QuotedTableName(), scope.QuoteIfPossible(keyName), scope.QuoteIfPossible(field), scope.QuoteIfPossible(dest), onDelete, onUpdate)).Exec()
 }
 
 func (scope *Scope) removeIndex(indexName string) {