diff --git a/LICENSE.md b/LICENSE.md
index 201ef1d..a53d88f 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,4 +1,5 @@
 Copyright (c) 2015, Joker
+Copyright (c) 2020, Gerasimos Maropoulos <kataras2006@hotmail.com>
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/cmd/jade/go_ast_wstr.go b/cmd/jade/go_ast_wstr.go
index d948039..497c43c 100644
--- a/cmd/jade/go_ast_wstr.go
+++ b/cmd/jade/go_ast_wstr.go
@@ -110,7 +110,7 @@ func (ws *writeStrings) fillConstNode(decl []ast.Decl) {
 		for _, v := range ws.constSlice {
 			constNode.Specs = append(constNode.Specs, &ast.ValueSpec{
 				Names: []*ast.Ident{
-					&ast.Ident{Name: v.name},
+					{Name: v.name},
 				},
 				Values: []ast.Expr{
 					&ast.BasicLit{Kind: 9, Value: "`" + v.str + "`"}, // 9 => string
diff --git a/go.mod b/go.mod
index 81826e3..9ff10f3 100644
--- a/go.mod
+++ b/go.mod
@@ -5,3 +5,5 @@ require (
 	github.com/valyala/bytebufferpool v1.0.0
 	golang.org/x/tools v0.0.0-20190327201419-c70d86f8b7cf
 )
+
+go 1.13
diff --git a/go.sum b/go.sum
index 0ca4334..66270fa 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,5 @@
 github.com/Joker/hpp v1.0.0 h1:65+iuJYdRXv/XyN62C1uEmmOx3432rNG/rKlX6V7Kkc=
 github.com/Joker/hpp v1.0.0/go.mod h1:8x5n+M1Hp5hC0g8okX3sR3vFQwynaX/UgSOM9MeBKzY=
-github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
@@ -8,5 +7,4 @@ golang.org/x/net v0.0.0-20190327091125-710a502c58a2 h1:17UhVDrPb40BH5k6cyeb2V/7Q
 golang.org/x/net v0.0.0-20190327091125-710a502c58a2/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20190327201419-c70d86f8b7cf h1:++r/Kj1CfG42p6XntDItK1TfB5V6Vq/baDeKvV1q5gY=
 golang.org/x/tools v0.0.0-20190327201419-c70d86f8b7cf/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
diff --git a/jade_parse.go b/jade_parse.go
index e725828..8423ca1 100644
--- a/jade_parse.go
+++ b/jade_parse.go
@@ -1,7 +1,6 @@
 package jade
 
 import (
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -444,47 +443,40 @@ func (t *Tree) parseSubFile(path string) *ListNode {
 	var incTree = New(path)
 	incTree.block = t.block
 	incTree.mixin = t.mixin
-	wd, _ := os.Getwd()
 
-	dir, file := filepath.Split(path)
-	if dir != "" && dir != "./" {
-		os.Chdir(dir)
-	}
-
-	_, err := incTree.Parse(t.read(file))
+	_, err := incTree.Parse(t.read(path))
 	if err != nil {
 		d, _ := os.Getwd()
 		t.errorf(`in '%s' subtemplate '%s': parseSubFile() error: %s`, d, path, err)
 	}
 
-	os.Chdir(wd)
 	return incTree.Root
 }
 
+var extensions = [...]string{".jade", ".pug", ".js", ".css", ".tpl", ".md"}
+
 func (t *Tree) read(path string) []byte {
+	currentTmplDir, _ := filepath.Split(t.Name)
+	path = currentTmplDir + path
+
 	var (
 		bb  []byte
-		ext string
 		err error
 	)
-	switch ext = filepath.Ext(path); ext {
-	case ".jade", ".pug", ".js", ".css", ".tpl", ".md":
-		bb, err = ioutil.ReadFile(path)
-	case "":
-		if _, err = os.Stat(path + ".jade"); os.IsNotExist(err) {
-			if _, err = os.Stat(path + ".pug"); os.IsNotExist(err) {
-				wd, _ := os.Getwd()
-				t.errorf("in '%s' subtemplate '%s': file path error: '.jade' or '.pug' file required", wd, path)
-			} else {
-				ext = ".pug"
-			}
-		} else {
-			ext = ".jade"
+
+	ext := filepath.Ext(path)
+
+	for _, s := range extensions {
+		if s == ext {
+			bb, err = t.ReadFunc(path)
+			break
+		}
+
+		if bb, err = t.ReadFunc(path + s); err == nil {
+			break
 		}
-		bb, err = ioutil.ReadFile(path + ext)
-	default:
-		t.errorf(`file extension  %s  is not supported`, ext)
 	}
+
 	if err != nil {
 		wd, _ := os.Getwd()
 		t.errorf(`%s  work dir: %s `, err, wd)
diff --git a/parse.go b/parse.go
index df14ede..2702b69 100644
--- a/parse.go
+++ b/parse.go
@@ -6,14 +6,20 @@ package jade
 
 import (
 	"fmt"
+	"io/ioutil"
 	"runtime"
 )
 
 // Tree is the representation of a single parsed template.
 type Tree struct {
-	Name string    // name of the template represented by the tree.
-	Root *ListNode // top-level root of the tree.
-	text string    // text parsed to create the template (or its parent)
+	Name string // name of the template represented by the tree.
+	// ReadFunc is used to read files that are required when parsing a template (e.g. extends $file).
+	// Set to a custom reader to override the default behavior from reading by system directory.
+	//
+	// See https://github.com/kataras/iris/issues/1450.
+	ReadFunc func(path string) ([]byte, error)
+	Root     *ListNode // top-level root of the tree.
+	text     string    // text parsed to create the template (or its parent)
 
 	// Parsing only; cleared after parse.
 	lex       *lexer
@@ -30,9 +36,10 @@ func (t *Tree) Copy() *Tree {
 		return nil
 	}
 	return &Tree{
-		Name: t.Name,
-		Root: t.Root.CopyList(),
-		text: t.text,
+		Name:     t.Name,
+		ReadFunc: t.ReadFunc,
+		Root:     t.Root.CopyList(),
+		text:     t.text,
 	}
 }
 
@@ -137,9 +144,15 @@ func (t *Tree) Parse(text []byte) (tree *Tree, err error) {
 
 // New allocates a new parse tree with the given name.
 func New(name string) *Tree {
+	return NewWithReadFunc(name, ioutil.ReadFile)
+}
+
+// NewWithReadFunc same as `New` but it overrides the template's contents reader.
+func NewWithReadFunc(name string, readFunc func(string) ([]byte, error)) *Tree {
 	return &Tree{
-		Name:  name,
-		mixin: map[string]*MixinNode{},
-		block: map[string]*ListNode{},
+		Name:     name,
+		ReadFunc: readFunc,
+		mixin:    map[string]*MixinNode{},
+		block:    map[string]*ListNode{},
 	}
 }