diff --git a/engine/sc_report_html_player.cpp b/engine/sc_report_html_player.cpp
index 2a37f6414..0a894ac5b 100644
--- a/engine/sc_report_html_player.cpp
+++ b/engine/sc_report_html_player.cpp
@@ -1987,7 +1987,7 @@ static void print_html_player_buffs( FILE* file, player_t* p )
         if ( uptime > 0 )
         {
           fprintf( file,
-                   "\t\t\t\t\t\t\t\t\t\t<li><span class=\"label\">%s_%zd:</span>%.1f%%</li>\n",
+                   "\t\t\t\t\t\t\t\t\t\t<li><span class=\"label\">%s_%d:</span>%.1f%%</li>\n",
                    b -> name(), j,
                    uptime * 100.0 );
         }
diff --git a/qt/main.cpp b/qt/main.cpp
index d0094b1c6..5476849d7 100644
--- a/qt/main.cpp
+++ b/qt/main.cpp
@@ -1,6 +1,10 @@
 #include <QLocale>
-#include <QtGui/QApplication>
 #include <locale>
+#ifdef QT_VERSION_5
+#include <QtGui/QGuiApplication>
+#else
+#include <QtGui/QApplication>
+#endif
 #include "simulationcraftqt.hpp"
 #ifndef SIMC_NO_AUTOUPDATE
 #include "sc_autoupdate.h"
diff --git a/qt/sc_window.cpp b/qt/sc_window.cpp
index 2430a6149..8ca848d65 100644
--- a/qt/sc_window.cpp
+++ b/qt/sc_window.cpp
@@ -490,7 +490,6 @@ void SimulationCraftWindow::createCmdLine()
   cmdLineLayout->addWidget( mainButton = new QPushButton( "Simulate!" ) );
   backButton->setMaximumWidth( 30 );
   forwardButton->setMaximumWidth( 30 );
-  progressBar->setStyle( new QPlastiqueStyle() );
   progressBar->setMaximum( 100 );
   progressBar->setMaximumWidth( 200 );
   progressBar->setMinimumWidth( 150 );
@@ -865,12 +864,12 @@ void SimulationCraftWindow::createCustomTab()
   customGlyphsTab = new QWidget();
   customGlyphsTab->setObjectName( QString::fromUtf8( "customGlyphsTab" ) );
   createCustomProfileDock->addTab( customGlyphsTab, QString() );
-  createCustomProfileDock->setTabText( createCustomProfileDock->indexOf( customGearTab ), QApplication::translate( "createCustomTab", "Gear", 0, QApplication::UnicodeUTF8 ) );
-  createCustomProfileDock->setTabToolTip( createCustomProfileDock->indexOf( customGearTab ), QApplication::translate( "createCustomTab", "Customise Gear Setup", 0, QApplication::UnicodeUTF8 ) );
-  createCustomProfileDock->setTabText( createCustomProfileDock->indexOf( customTalentsTab ), QApplication::translate( "createCustomTab", "Talents", 0, QApplication::UnicodeUTF8 ) );
-  createCustomProfileDock->setTabToolTip( createCustomProfileDock->indexOf( customTalentsTab ), QApplication::translate( "createCustomTab", "Customise Talents", 0, QApplication::UnicodeUTF8 ) );
-  createCustomProfileDock->setTabText( createCustomProfileDock->indexOf( customGlyphsTab ), QApplication::translate( "createCustomTab", "Glyphs", 0, QApplication::UnicodeUTF8 ) );
-  createCustomProfileDock->setTabToolTip( createCustomProfileDock->indexOf( customGlyphsTab ), QApplication::translate( "createCustomTab", "Customise Glyphs", 0, QApplication::UnicodeUTF8 ) );
+  createCustomProfileDock -> setTabText( createCustomProfileDock -> indexOf( customGearTab ), tr( "Gear", "createCustomTab" ) );
+  createCustomProfileDock -> setTabToolTip( createCustomProfileDock -> indexOf( customGearTab ), tr( "Customise Gear Setup", "createCustomTab" ) );
+  createCustomProfileDock -> setTabText( createCustomProfileDock -> indexOf( customTalentsTab ), tr( "Talents", "createCustomTab" ) );
+  createCustomProfileDock -> setTabToolTip( createCustomProfileDock -> indexOf( customTalentsTab ), tr( "Customise Talents", "createCustomTab" ) );
+  createCustomProfileDock -> setTabText( createCustomProfileDock -> indexOf( customGlyphsTab ), tr( "Glyphs", "createCustomTab" ) );
+  createCustomProfileDock -> setTabToolTip( createCustomProfileDock -> indexOf( customGlyphsTab ), tr( "Customise Glyphs", "createCustomTab" ) );
 }
 
 void SimulationCraftWindow::createSimulateTab()
@@ -1211,10 +1210,11 @@ void SimulationCraftWindow::importFinished()
 
 void SimulateThread::run()
 {
+  QByteArray utf8_profile = options.toUtf8();
   QFile file( "simc_gui.simc" );
   if ( file.open( QIODevice::WriteOnly ) )
   {
-    file.write( options.toAscii() );
+    file.write( utf8_profile );
     file.close();
   }
 
@@ -1479,7 +1479,7 @@ void SimulationCraftWindow::saveLog()
 
   if ( file.open( QIODevice::WriteOnly ) )
   {
-    file.write( logText->toPlainText().toAscii() );
+    file.write( logText->toPlainText().toUtf8() );
     file.close();
   }
 
@@ -1499,7 +1499,7 @@ void SimulationCraftWindow::saveResults()
 
   if ( file.open( QIODevice::WriteOnly ) )
   {
-    file.write( visibleWebView->property("resultHTML").toString().toAscii() );
+    file.write( visibleWebView->property("resultHTML").toString().toUtf8() );
     file.close();
   }
 
@@ -1711,7 +1711,7 @@ void SimulationCraftWindow::historyDoubleClicked( QListWidgetItem* item )
 
   if ( mrRobotBuilderView )
   {
-    mrRobotBuilderView->setUrl( QUrl::fromEncoded( url.toAscii() ) );
+    mrRobotBuilderView->setUrl( QUrl::fromEncoded( url.toUtf8() ) );
     importTab->setCurrentIndex( TAB_MR_ROBOT );
   }
 }
diff --git a/qt/simulationcraftqt.hpp b/qt/simulationcraftqt.hpp
index 70fe53810..5961fcf15 100644
--- a/qt/simulationcraftqt.hpp
+++ b/qt/simulationcraftqt.hpp
@@ -9,6 +9,10 @@
 #include "simulationcraft.hpp"
 #include <QtGui/QtGui>
 #include <QtWebKit>
+#ifdef QT_VERSION_5
+#include <QtWidgets/QtWidgets>
+#include <QtWebKitWidgets/QtWebKitWidgets>
+#endif
 
 enum master_tabs {
   TAB_WELCOME,
diff --git a/simcqt.pro b/simcqt.pro
index ae9917aa5..d8710cd0c 100644
--- a/simcqt.pro
+++ b/simcqt.pro
@@ -8,6 +8,11 @@ exists( build.conf ) {
   include( build.conf )
 }
 
+contains ( QT_MAJOR_VERSION , 5 ) {
+QT += widgets webkitwidgets
+DEFINES += QT_VERSION_5
+}
+
 QMAKE_CXXFLAGS += $$OPTS
 
 QMAKE_CXXFLAGS_RELEASE += -DNDEBUG