diff --git a/qtpropertybrowser/ColorSchemeComboBox.cpp b/qtpropertybrowser/ColorSchemeComboBox.cpp
index 63bff3b..98dd40f 100644
--- a/qtpropertybrowser/ColorSchemeComboBox.cpp
+++ b/qtpropertybrowser/ColorSchemeComboBox.cpp
@@ -13,7 +13,7 @@ static Value getData(const QMap<const QtProperty *, PrivateData> &propertyMap,
 	const QtProperty *property, const Value &defaultValue = Value())
 {
 	typedef QMap<const QtProperty *, PrivateData> PropertyToData;
-    typedef PropertyToData::const_iterator PropertyToDataConstIterator;
+    typedef typename PropertyToData::const_iterator PropertyToDataConstIterator;
 	const PropertyToDataConstIterator it = propertyMap.constFind(property);
 	if (it == propertyMap.constEnd())
 		return defaultValue;
diff --git a/qtpropertybrowser/Gradient.cpp b/qtpropertybrowser/Gradient.cpp
index 2b0c15e..bb2e9ec 100644
--- a/qtpropertybrowser/Gradient.cpp
+++ b/qtpropertybrowser/Gradient.cpp
@@ -1,6 +1,7 @@
 #include "Gradient.h"
 #include <QCoreApplication>
 
+#include "math.h"
 //extern char *GetBinDir(char *str);
 
 BYTE GetRValue(COLORREF colour)
diff --git a/qtpropertybrowser/qtColorSchemeComboBox.cpp b/qtpropertybrowser/qtColorSchemeComboBox.cpp
index fb49e22..a1c2433 100644
--- a/qtpropertybrowser/qtColorSchemeComboBox.cpp
+++ b/qtpropertybrowser/qtColorSchemeComboBox.cpp
@@ -1,4 +1,4 @@
-/*
+/*
  * QtColorSchemeComboBox.cpp
  *
  *  Created on: 2013-5-27
@@ -12,6 +12,7 @@
 #include <QTextStream>
 #include "qtColorSchemeComboBox.h"
 #include "Gradient.h"
+#include <math.h>
 
 QtColorSchemeComboBox::QtColorSchemeComboBox(QWidget *parent):QtComboBox(parent), m_isShowText(true)
 {