diff --git a/wrap/io_trimesh/export_off.h b/wrap/io_trimesh/export_off.h
index 463a202d..44d14c3a 100644
--- a/wrap/io_trimesh/export_off.h
+++ b/wrap/io_trimesh/export_off.h
@@ -31,6 +31,7 @@
 
 #include <stdio.h>
 #include <wrap/io_trimesh/io_mask.h>
+#include<wrap/io_trimesh/precision.h>
 #include <vcg/complex/algorithms/clean.h>
 #include <vcg/complex/algorithms/polygon_support.h>