diff --git a/sdrgui/gui/loglabelslider.cpp b/sdrgui/gui/loglabelslider.cpp
index 064e4eba2..763224ed9 100644
--- a/sdrgui/gui/loglabelslider.cpp
+++ b/sdrgui/gui/loglabelslider.cpp
@@ -17,6 +17,8 @@
 
 #include <QDebug>
 
+#include <cmath>
+
 #include "loglabelslider.h"
 
 LogLabelSlider::LogLabelSlider(QWidget *parent) :
diff --git a/sdrgui/gui/logslider.cpp b/sdrgui/gui/logslider.cpp
index 5a4c13be3..3144ea266 100644
--- a/sdrgui/gui/logslider.cpp
+++ b/sdrgui/gui/logslider.cpp
@@ -19,6 +19,9 @@
 #include <QPainter>
 #include <QDebug>
 
+#include <cmath>
+
+
 #include "logslider.h"
 
 LogSlider::LogSlider(QWidget *parent) :