diff --git a/Backend-libXML/Parser.py b/Backend-libXML/Parser.py
index 547b5f5..442484d 100644
--- a/Backend-libXML/Parser.py
+++ b/Backend-libXML/Parser.py
@@ -23,7 +23,7 @@ def formatHTML(source: str, prettify: bool) -> str:
         return html.tostring(htmlDoc).decode().replace("\n", "").replace(">    ", ">")
     return etree.tostring(htmlDoc, encoding='unicode', pretty_print=True)
 
-def formatXML(source: str) -> str:
+def formatXML(source: str, prettify: bool) -> str:
     """Method used to format XML
 
     :param source: XML to format
@@ -46,7 +46,10 @@ def formatXML(source: str) -> str:
     parser = etree.XMLParser(remove_blank_text=True)
     xml = etree.parse(byte_input, parser=parser)
 
-    return prolog + etree.tostring(xml, pretty_print=False).decode()
+    if prettify:
+        prolog += "\n"
+
+    return prolog + etree.tostring(xml, pretty_print=prettify).decode()
 
 
 def xpath(source: str, xpath: str) -> str:
diff --git a/Backend-libXML/main.py b/Backend-libXML/main.py
index 52999b4..88550a8 100644
--- a/Backend-libXML/main.py
+++ b/Backend-libXML/main.py
@@ -36,8 +36,8 @@ def process_xml(request: request, type: str) -> str:
             response_json['result'] = Parser.xslt(data, processorData)
         elif (type == "xpath"):
             response_json['result'], response_json['type'] = Parser.xpath(data, processorData)
-        # elif (type == "prettify"):
-        #     response_json['result'] = Parser.formatXML(data, True)
+        elif (type == "prettify"):
+            response_json['result'] = Parser.formatXML(data, True)
         elif (type == "minimize"):
             response_json['result'] = Parser.formatXML(data, False)
         elif (type == "prettifyHtml"):
@@ -77,10 +77,9 @@ def xsd():
 def xslt():
     return process_xml(request, "xslt")
 
-# Removed because lxml can't pretify <xs:complexType mixed="true">
-# @app.route("/prettify", methods=["POST"])
-# def prettify():
-#     return process_xml(request, "prettify")
+@app.route("/prettify", methods=["POST"])
+def prettify():
+    return process_xml(request, "prettify")
 
 @app.route("/minimize", methods=["POST"])
 def minimize():