diff --git a/src/exquisite/qqtbodymouselocker_win.cpp b/src/exquisite/qqtbodymouselocker_win.cpp
index 29547e34..69288f48 100644
--- a/src/exquisite/qqtbodymouselocker_win.cpp
+++ b/src/exquisite/qqtbodymouselocker_win.cpp
@@ -1,4 +1,4 @@
-#include "qqtbodymouselocker_win.h"
+#include "qqtbodymouselocker_win.h"
 #include <QWidget>
 #include <QEvent>
 #include <QMouseEvent>
@@ -69,7 +69,11 @@ QRect QQtBodyMouseLockerPrivate::getTargetRect ( QWidget* target )
     p0 = w.mapToGlobal ( p0 );
     p1 = w.mapToGlobal ( p1 );
 
+#if QT_VERSION > QT_VERSION_CHECK(5, 5, 1)
     qreal ratio = w.devicePixelRatioF();
+#else
+    qreal ratio = 1.0;
+#endif
     QRect r0 = QRect ( p0, p1 );
     QRect qr0 = QRect ( QPoint ( r0.left() * ratio, r0.top() * ratio ),
                         QPoint ( r0.right() * ratio, r0.bottom() * ratio ) );
@@ -95,7 +99,11 @@ QRect QQtBodyMouseLockerPrivate::getSourceRect ( QWidget* target )
     p1 = w.mapToGlobal ( p1 );
     QRect r0 = QRect ( p0, p1 );
 
+#if QT_VERSION > QT_VERSION_CHECK(5, 5, 1)
     qreal ratio = w.devicePixelRatioF();
+#else
+    qreal ratio = 1.0;
+#endif
     QRect qr0 = QRect ( QPoint ( r0.left() * ratio, r0.top() * ratio ), QPoint ( r0.right() * ratio, r0.bottom() * ratio ) );
     return qr0;
 }
diff --git a/src/exquisite/qqtbodymousewheelscalingeffect.cpp b/src/exquisite/qqtbodymousewheelscalingeffect.cpp
index 6ea8faab..e1e882b9 100644
--- a/src/exquisite/qqtbodymousewheelscalingeffect.cpp
+++ b/src/exquisite/qqtbodymousewheelscalingeffect.cpp
@@ -65,7 +65,11 @@ void QQtBodyMouseWheelScalingEffect::wheelEvent ( QWheelEvent* event, QWidget* t
         p1 = w.mapToGlobal ( p1 );
         QRect r0 = QRect ( p0, p1 );
 #ifdef __DESKTOP_WIN__
+#if QT_VERSION > QT_VERSION_CHECK(5, 5, 1)
         qreal ratio = w.devicePixelRatioF();
+#else
+        qreal ratio = 1.0;
+#endif
 #else
         qreal ratio = 1;
 #endif
diff --git a/src/network/qqtwebloader.cpp b/src/network/qqtwebloader.cpp
index 40d7a90d..4459dc84 100644
--- a/src/network/qqtwebloader.cpp
+++ b/src/network/qqtwebloader.cpp
@@ -40,9 +40,15 @@ QQtNetworkReply& QQtNetworkReply::operator = ( const QNetworkReply& other )
 #if QT_VERSION > QT_VERSION_CHECK(5, 9, 0)
     for ( int i = ( int ) QNetworkRequest::HttpStatusCodeAttribute;
           i <= ( int ) QNetworkRequest::RedirectPolicyAttribute; i++ )
-#else
+#elif QT_VERSION > QT_VERSION_CHECK(5, 6, 3)
     for ( int i = ( int ) QNetworkRequest::HttpStatusCodeAttribute;
           i <= ( int ) QNetworkRequest::HTTP2WasUsedAttribute; i++ )
+#elif QT_VERSION > QT_VERSION_CHECK(5, 5, 1)
+    for ( int i = ( int ) QNetworkRequest::HttpStatusCodeAttribute;
+          i <= ( int ) QNetworkRequest::FollowRedirectsAttribute; i++ )
+#else
+    for ( int i = ( int ) QNetworkRequest::HttpStatusCodeAttribute;
+          i <= ( int ) QNetworkRequest::EmitAllUploadProgressSignalsAttribute; i++ )
 #endif
     {
         QNetworkRequest::Attribute ii = ( QNetworkRequest::Attribute ) i;