diff --git a/c++/jackmeter/jackmeter.cpp b/c++/jackmeter/jackmeter.cpp
index 93d7bed..b2c1c6a 100644
--- a/c++/jackmeter/jackmeter.cpp
+++ b/c++/jackmeter/jackmeter.cpp
@@ -26,6 +26,7 @@
 #include "../jack_utils.hpp"
 #include "../widgets/digitalpeakmeter.hpp"
 
+#include <cmath>
 #include <QtGui/QApplication>
 #include <QtGui/QIcon>
 #include <QtGui/QMessageBox>