diff --git a/STL_Extension/include/CGAL/assertions.h b/STL_Extension/include/CGAL/assertions.h
index d802ed3a3b9f..cf793f466bee 100644
--- a/STL_Extension/include/CGAL/assertions.h
+++ b/STL_Extension/include/CGAL/assertions.h
@@ -19,7 +19,6 @@
 #ifndef CGAL_ASSERTIONS_H
 #define CGAL_ASSERTIONS_H
 
-
 #include <CGAL/export/CGAL.h>
 
 // #include <CGAL/assertions_behaviour.h> // for backward compatibility