diff --git a/plugins/rendermax/renderer_opengl.hpp b/plugins/rendermax/renderer_opengl.hpp
index ce14f3762..7a1a098c8 100644
--- a/plugins/rendermax/renderer_opengl.hpp
+++ b/plugins/rendermax/renderer_opengl.hpp
@@ -14,6 +14,7 @@
 #include "df/texture_handler.h"
 #include "df/graphic.h"
 #include <math.h>
+#include <cmath>
 
 using df::renderer;
 using df::init;