diff --git a/phplanguagesupport.cpp b/phplanguagesupport.cpp
index 7625110..390699b 100644
--- a/phplanguagesupport.cpp
+++ b/phplanguagesupport.cpp
@@ -1,189 +1,196 @@
 /*****************************************************************************
  * Copyright (c) 2007 Piyush verma <piyush.verma@gmail.com>                  *
  * Copyright (c) 2009 Niko Sams <niko.sams@gmail.com>                        *
  * Copyright (c) 2010 Milian Wolff <mail@milianw.de>                         *
  *                                                                           *
  * This program is free software; you can redistribute it and/or modify      *
  * it under the terms of the GNU General Public License as published by      *
  * the Free Software Foundation; either version 2 of the License, or         *
  * (at your option) any later version.                                       *
  *                                                                           *
  * This program is distributed in the hope that it will be useful,           *
  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
  * GNU General Public License for more details.                              *
  *                                                                           *
  * You should have received a copy of the GNU General Public License         *
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.     *
  *****************************************************************************/
 
 #include "phplanguagesupport.h"
 
 #include <QMutexLocker>
 #include <QReadWriteLock>
 
 #include <kpluginfactory.h>
 #include <kpluginloader.h>
 #include <KTextEditor/Document>
 
 #include <interfaces/icore.h>
 #include <interfaces/ilanguagecontroller.h>
 #include <interfaces/iplugincontroller.h>
 #include <interfaces/idocument.h>
 #include <interfaces/iproject.h>
 #include <language/backgroundparser/backgroundparser.h>
 #include <language/duchain/duchain.h>
 #include <language/duchain/duchainlock.h>
 #include <interfaces/idocumentcontroller.h>
 #include <interfaces/contextmenuextension.h>
 #include <language/interfaces/editorcontext.h>
 
 #include "phpparsejob.h"
 #include "phphighlighting.h"
 #include "kdevphpversion.h"
 #include "phpdebug.h"
 #include "codegen/refactoring.h"
 
 #include <language/codecompletion/codecompletion.h>
 #include <language/codecompletion/codecompletionmodel.h>
 
 #include "completion/model.h"
 #include "completion/worker.h"
 
 #include "navigation/navigationwidget.h"
 #include <language/duchain/parsingenvironment.h>
 
 #include "duchain/helper.h"
 #include <QTimer>
 
 using namespace KTextEditor;
 using namespace KDevelop;
 
 K_PLUGIN_FACTORY_WITH_JSON(KDevPhpSupportFactory, "kdevphpsupport.json", registerPlugin<Php::LanguageSupport>(); )
 
 namespace Php
 {
 
 LanguageSupport::LanguageSupport(QObject* parent, const QVariantList& /*args*/)
         : KDevelop::IPlugin(QStringLiteral("kdevphpsupport"), parent),
         KDevelop::ILanguageSupport()
 {
     Q_ASSERT(internalFunctionFile().toUrl().isValid());
 
     m_highlighting = new Php::Highlighting(this);
     m_refactoring = new Php::Refactoring(this);
 
     auto* ccModel = new CodeCompletionModel(this);
     new KDevelop::CodeCompletion(this, ccModel, name());
 }
 
 LanguageSupport::~LanguageSupport()
 {
     parseLock()->lockForWrite();
     //By locking the parse-mutexes, we make sure that parse- and preprocess-jobs
     //get a chance to finish in a good state
     parseLock()->unlock();
 }
 
 KDevelop::ParseJob *LanguageSupport::createParseJob(const IndexedString &url)
 {
-    return new ParseJob(url, this);
+    auto *job = new ParseJob(url, this);
+
+    // bypass the 5 MB maximum file size limit for the internal file
+    if (url == internalFunctionFile()) {
+        job->setMaximumFileSize(std::numeric_limits<qint64>::max());
+    }
+
+    return job;
 }
 
 QString LanguageSupport::name() const
 {
     return QStringLiteral("Php");
 }
 
 KDevelop::ICodeHighlighting* LanguageSupport::codeHighlighting() const
 {
     return m_highlighting;
 }
 
 ContextMenuExtension LanguageSupport::contextMenuExtension(Context* context, QWidget* parent)
 {
     ContextMenuExtension cm;
     EditorContext *ed = dynamic_cast<KDevelop::EditorContext *>(context);
 
     if (ed && ICore::self()->languageController()->languagesForUrl(ed->url()).contains(this)) {
         // It's safe to add our own ContextMenuExtension.
         m_refactoring->fillContextMenu(cm, context, parent);
     }
     return cm;
 }
 
 QPair<QString, Range> LanguageSupport::wordUnderCursor(const QUrl& url, const Cursor& position)
 {
     KDevelop::IDocument* doc = core()->documentController()->documentForUrl(url);
     if(!doc || !doc->textDocument())
         return {};
 
     int lineNumber = position.line();
     int lineLength = doc->textDocument()->lineLength(lineNumber);
 
     QString line = doc->textDocument()->text(Range(lineNumber, 0, lineNumber, lineLength));
 
     int startCol = position.column();
     for ( ; startCol >= 0; --startCol ) {
         if ( !line[startCol].isLetter() && line[startCol] != '_' ) {
             // don't include the wrong char
             if ( startCol != position.column() ) {
                 ++startCol;
             }
             break;
         }
     }
     int endCol = position.column();
     for ( ; endCol <= lineLength; ++endCol ) {
         if ( !line[endCol].isLetter() && line[endCol] != '_' ) {
             break;
         }
     }
     QString word = line.mid(startCol, endCol - startCol);
     Range range(lineNumber, startCol, lineNumber, endCol);
     return qMakePair(word, range);
 }
 
 bool isMagicConstant(QPair<QString, Range> word) {
     if ( word.second.isValid() && !word.second.isEmpty() ) {
         if ( word.first == QLatin1String("__FILE__") || word.first == QLatin1String("__LINE__") ||
              word.first == QLatin1String("__METHOD__") || word.first == QLatin1String("__CLASS__") ||
              word.first == QLatin1String("__FUNCTION__") || word.first == QLatin1String("__NAMESPACE__") ||
              word.first == QLatin1String("__DIR__") || word.first == QLatin1String("__TRAIT__")
            )
         {
             ///TODO: maybe we should use the tokenizer to really make sure this is such a token
             ///      and we are not inside a string, comment or similar
             ///      otoh, it doesn't hurt imo
             return true;
         }
     }
     return false;
 }
 
 QPair<QWidget*, Range> LanguageSupport::specialLanguageObjectNavigationWidget(const QUrl& url, const Cursor& position)
 {
     QPair<QString, Range> word = wordUnderCursor(url, position);
     if ( isMagicConstant(word) ) {
         DUChainReadLocker lock;
         if (TopDUContext* top = standardContext(url)) {
             return {new NavigationWidget(TopDUContextPointer(top), position, word.first), word.second};
         } else {
             return {nullptr, Range::invalid()};
         }
     }
     return ILanguageSupport::specialLanguageObjectNavigationWidget(url, position);
 }
 
 Range LanguageSupport::specialLanguageObjectRange(const QUrl& url, const Cursor& position)
 {
     QPair<QString, Range> word = wordUnderCursor(url, position);
     if ( isMagicConstant(word) ) {
         return word.second;
     }
     return ILanguageSupport::specialLanguageObjectRange(url, position);
 }
 
 }
 
 #include "phplanguagesupport.moc"