diff --git a/bindings/cxx/classes.cpp b/bindings/cxx/classes.cpp
index ec9b6d8f..42ef6e7d 100644
--- a/bindings/cxx/classes.cpp
+++ b/bindings/cxx/classes.cpp
@@ -20,6 +20,7 @@
 #include "libsigrok/libsigrok.hpp"
 
 #include <sstream>
+#include <cmath>
 
 namespace sigrok
 {