diff --git a/library.cpp b/library.cpp
index bee948b..ee7191a 100644
--- a/library.cpp
+++ b/library.cpp
@@ -6,6 +6,8 @@
 #include <QFileDialog>
 #include <QDebug>
 #include "cdac.h"
+#include <QtMath>
+#include <cmath>
 
 library::library(QWidget *parent) :
     QDialog(parent),