diff --git a/Distance_3/include/CGAL/squared_distance_Point_3_Triangle_3.h b/Distance_3/include/CGAL/squared_distance_Point_3_Triangle_3.h
index bde0aa1511f..efb25b4895e 100644
--- a/Distance_3/include/CGAL/squared_distance_Point_3_Triangle_3.h
+++ b/Distance_3/include/CGAL/squared_distance_Point_3_Triangle_3.h
@@ -17,6 +17,9 @@
 #ifndef CGAL_DISTANCE_3_POINT_3_TRIANGLE_3_H
 #define CGAL_DISTANCE_3_POINT_3_TRIANGLE_3_H
 
+#include <CGAL/internal/squared_distance_utils_3.h>
+#include <CGAL/squared_distance_Point_3_Segment_3.h>
+
 #include <CGAL/Point_3.h>
 #include <CGAL/Triangle_3.h>