diff --git a/configure b/configure
index 73677210e..5e546568a 100755
--- a/configure
+++ b/configure
@@ -312,11 +312,7 @@ public:
 		if(!conf->getenv("QC_DISABLE_GUI").isEmpty()) {
 			conf->addDefine("DISABLE_GUI");
 		}	
-		if(QT_VERSION >= 0x040500) {
-                        conf->addDefine("QT_4_5");
-                }
 		return(QT_VERSION >= 0x040400);
-		
 	}
 };
 #line 1 "pkg-config.qcm"
diff --git a/qcm/qt4.qcm b/qcm/qt4.qcm
index 59b564275..f20a2b6ff 100644
--- a/qcm/qt4.qcm
+++ b/qcm/qt4.qcm
@@ -15,10 +15,6 @@ public:
 		if(!conf->getenv("QC_DISABLE_GUI").isEmpty()) {
 			conf->addDefine("DISABLE_GUI");
 		}	
-		if(QT_VERSION >= 0x040500) {
-                        conf->addDefine("QT_4_5");
-                }
 		return(QT_VERSION >= 0x040400);
-		
 	}
 };
diff --git a/src/feeddownloader.h b/src/feeddownloader.h
index 22b7a085d..c179f6a90 100644
--- a/src/feeddownloader.h
+++ b/src/feeddownloader.h
@@ -46,7 +46,7 @@
 #include "bittorrent.h"
 #include "ui_feeddownloader.h"
 
-#ifdef QT_4_5
+#if QT_VERSION >= 0x040500
 #include <QHash>
 #else
 #include <QMap>
diff --git a/src/rss.cpp b/src/rss.cpp
index 5c3f802f6..a6110fae2 100644
--- a/src/rss.cpp
+++ b/src/rss.cpp
@@ -31,12 +31,12 @@
 #include "rss.h"
 #include "preferences.h"
 
-#ifdef QT_4_5
-#include <QHash>
-#else
+#if QT_VERSION < 0x040500
 #include <QMap>
 #define QHash QMap
 #define toHash toMap
+#else
+#include <QHash>
 #endif
 
 /** RssFolder **/
diff --git a/src/rss.h b/src/rss.h
index f0037f7bc..5c0d58730 100644
--- a/src/rss.h
+++ b/src/rss.h
@@ -49,7 +49,7 @@
 #include "bittorrent.h"
 #include "downloadthread.h"
 
-#ifdef QT_4_5
+#if QT_VERSION >= 0x040500
 #include <QHash>
 #else
 #include <QMap>
diff --git a/src/rss_imp.h b/src/rss_imp.h
index 4524ea883..04b3549c2 100644
--- a/src/rss_imp.h
+++ b/src/rss_imp.h
@@ -86,7 +86,7 @@ public:
 
 };
 
-#ifndef QT_4_5
+#if QT_VERSION < 0x040500
 #undef QHash
 #undef toHash
 #endif
diff --git a/src/searchengine.cpp b/src/searchengine.cpp
index 236684798..650b3cc96 100644
--- a/src/searchengine.cpp
+++ b/src/searchengine.cpp
@@ -58,7 +58,7 @@ SearchEngine::SearchEngine(GUI *parent, Bittorrent *BTSession) : QWidget(parent)
   // new qCompleter to the search pattern
   startSearchHistory();
   createCompleter();
-#ifdef QT_4_5
+#if QT_VERSION >= 0x040500
   tabWidget->setTabsClosable(true);
   connect(tabWidget, SIGNAL(tabCloseRequested(int)), this, SLOT(closeTab(int)));
 #else
@@ -119,7 +119,7 @@ SearchEngine::~SearchEngine(){
     downloader->waitForFinished();
     delete downloader;
   }
-#ifndef QT_4_5
+#if QT_VERSION < 0x040500
   delete closeTab_button;
 #endif
   delete searchTimeout;
@@ -234,7 +234,7 @@ void SearchEngine::on_search_button_clicked(){
   all_tab.append(currentSearchTab);
   tabWidget->addTab(currentSearchTab, pattern);
   tabWidget->setCurrentWidget(currentSearchTab);
-#ifndef QT_4_5
+#if QT_VERSION < 0x040500
   closeTab_button->setEnabled(true);
 #endif
   // if the pattern is not in the pattern
@@ -531,7 +531,7 @@ void SearchEngine::appendSearchResult(QString line){
   download_button->setEnabled(true);
 }
 
-#ifdef QT_4_5
+#if QT_VERSION >= 0x040500
 void SearchEngine::closeTab(int index) {
   if(index == tabWidget->indexOf(currentSearchTab)) {
     qDebug("Deleted current search Tab");
diff --git a/src/searchengine.h b/src/searchengine.h
index b40712443..9da9d8bcc 100644
--- a/src/searchengine.h
+++ b/src/searchengine.h
@@ -64,7 +64,7 @@ private:
   SupportedEngines *supported_engines;
   QTimer *searchTimeout;
   QPointer<SearchTab> currentSearchTab;
-#ifndef QT_4_5
+#if QT_VERSION < 0x040500
   QPushButton *closeTab_button;
 #endif
   QList<QPointer<SearchTab> > all_tab; // To store all tabs
@@ -106,10 +106,10 @@ protected slots:
   // Search slots
   void tab_changed(int);//to prevent the use of the download button when the tab is empty
   void on_search_button_clicked();
-#ifdef QT_4_5
-  void closeTab(int index);
-#else
+#if QT_VERSION < 0x040500
   void closeTab_button_clicked();
+#else
+  void closeTab(int index);
 #endif
   void appendSearchResult(QString line);
   void searchFinished(int exitcode,QProcess::ExitStatus);
diff --git a/src/torrentpersistentdata.h b/src/torrentpersistentdata.h
index 3c82dffc8..f6f5e1bbf 100644
--- a/src/torrentpersistentdata.h
+++ b/src/torrentpersistentdata.h
@@ -38,12 +38,12 @@
 #include "misc.h"
 #include <vector>
 
-#ifdef QT_4_5
-#include <QHash>
-#else
+#if QT_VERSION < 0x040500
 #include <QMap>
 #define QHash QMap
 #define toHash toMap
+#else
+#include <QHash>
 #endif
 
 class TorrentTempData {