diff --git a/lib/SongState.cpp b/lib/SongState.cpp
index 37b3b37..058e211 100644
--- a/lib/SongState.cpp
+++ b/lib/SongState.cpp
@@ -1,6 +1,7 @@
 #include "amuse/SongState.hpp"
 #include "amuse/Common.hpp"
 #include "amuse/Sequencer.hpp"
+#include <cmath>
 
 namespace amuse
 {