diff --git a/src/plot.cpp b/src/plot.cpp
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -21,6 +21,8 @@
 #include <QKeySequence>
 #include <QColor>
 
+#include <math.h>
+
 #include "plot.h"
 #include "utils.h"