diff --git a/include/osgAnimation/Timeline b/include/osgAnimation/Timeline
index daaaf2d58..26510d613 100644
--- a/include/osgAnimation/Timeline
+++ b/include/osgAnimation/Timeline
@@ -18,7 +18,6 @@
 #include <osg/Object>
 #include <map>
 #include <vector>
-#include <cmath>
 #include <osg/Notify>
 #include <osg/Group>
 #include <osgAnimation/Animation>