diff --git a/src/registerwidget.h b/src/registerwidget.h
--- a/src/registerwidget.h
+++ b/src/registerwidget.h
@@ -3,8 +3,13 @@
 #include <QtWidgets>
 #include <QWidget>
 #include <QTimer>
+#if defined(LPPMON_SDK_BUILD)
+#  define LPPMON_SDK_EXPORT Q_DECL_EXPORT
+#else
+#  define LPPMON_SDK_EXPORT Q_DECL_IMPORT
+#endif
 
-class regWidgetElement
+class LPPMON_SDK_EXPORT regWidgetElement
 {
 public:
     regWidgetElement(const QString& value,QFont font,int xMargin,int yMargin)
@@ -52,7 +57,7 @@ protected:
     int p_yMargins;
 };
 
-class bitfieldsElement: public regWidgetElement
+class LPPMON_SDK_EXPORT bitfieldsElement: public regWidgetElement
 {
     class bitFieldAttribute
     {
@@ -172,7 +177,7 @@ private:
 };
 
 
-class registerWidget : public QObject
+class LPPMON_SDK_EXPORT registerWidget : public QObject
 {
     Q_OBJECT
 public: