diff --git a/models/models.go b/models/models.go
index cd9dc38ac..fe17229cc 100644
--- a/models/models.go
+++ b/models/models.go
@@ -89,8 +89,16 @@ func SetEngine() (err error) {
 		orm, err = xorm.NewEngine("mysql", fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8",
 			DbCfg.User, DbCfg.Pwd, DbCfg.Host, DbCfg.Name))
 	case "postgres":
-		orm, err = xorm.NewEngine("postgres", fmt.Sprintf("user=%s password=%s dbname=%s sslmode=%s",
-			DbCfg.User, DbCfg.Pwd, DbCfg.Name, DbCfg.SslMode))
+		var host, port = "127.0.0.1", "5432"
+		fields := strings.Split(DbCfg.Host, ":")
+		if len(fields) > 0 {
+			host = fields[0]
+		}
+		if len(fields) > 1 {
+			port = fields[1]
+		}
+		orm, err = xorm.NewEngine("postgres", fmt.Sprintf("user=%s password=%s host=%s port=%s dbname=%s sslmode=%s",
+			DbCfg.User, DbCfg.Pwd, host, port, DbCfg.Name, DbCfg.SslMode))
 	case "sqlite3":
 		os.MkdirAll(path.Dir(DbCfg.Path), os.ModePerm)
 		orm, err = xorm.NewEngine("sqlite3", DbCfg.Path)
diff --git a/models/user.go b/models/user.go
index ffee2dd9e..ab43df7a1 100644
--- a/models/user.go
+++ b/models/user.go
@@ -76,7 +76,7 @@ func (user *User) AvatarLink() string {
 	if base.Service.EnableCacheAvatar {
 		return "/avatar/" + user.Avatar
 	}
-	return "http://1.gravatar.com/avatar/" + user.Avatar
+	return "//1.gravatar.com/avatar/" + user.Avatar
 }
 
 // NewGitSig generates and returns the signature of given user.
diff --git a/modules/base/tool.go b/modules/base/tool.go
index 082c03925..9b165b979 100644
--- a/modules/base/tool.go
+++ b/modules/base/tool.go
@@ -143,7 +143,7 @@ func AvatarLink(email string) string {
 	if Service.EnableCacheAvatar {
 		return "/avatar/" + EncodeMd5(email)
 	}
-	return "http://1.gravatar.com/avatar/" + EncodeMd5(email)
+	return "//1.gravatar.com/avatar/" + EncodeMd5(email)
 }
 
 // Seconds-based time units