diff --git a/Packages/Triangulation_3/include/CGAL/Triangulation_utils_3.h b/Packages/Triangulation_3/include/CGAL/Triangulation_utils_3.h
index 4f1f5b39adb..eadb4ef9256 100644
--- a/Packages/Triangulation_3/include/CGAL/Triangulation_utils_3.h
+++ b/Packages/Triangulation_3/include/CGAL/Triangulation_utils_3.h
@@ -23,6 +23,8 @@
 #ifndef CGAL_TRIANGULATION_UTILS_3_H
 #define CGAL_TRIANGULATION_UTILS_3_H
 
+#include <CGAL/triangulation_assertions.h>
+
 CGAL_BEGIN_NAMESPACE
 
 class Triangulation_utils_3