diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/certificate.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Certificate.h
similarity index 98%
rename from Frechet_distance/include/CGAL/Frechet_distance/internal/certificate.h
rename to Frechet_distance/include/CGAL/Frechet_distance/internal/Certificate.h
index 2fdeaf24ab9..4f962333ec8 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/certificate.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/Certificate.h
@@ -16,7 +16,7 @@
 #ifndef CGAL_FRECHET_DISTANCE_INTERNAL_CERTIFICATE_H
 #define CGAL_FRECHET_DISTANCE_INTERNAL_CERTIFICATE_H
 #include <CGAL/license/Frechet_distance.h>
-#include <CGAL/Frechet_distance/internal/curve.h>
+#include <CGAL/Frechet_distance/internal/Curve.h>
 #include <CGAL/Frechet_distance/internal/geometry_basics.h>
 
 namespace CGAL {
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/curve.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Curve.h
similarity index 99%
rename from Frechet_distance/include/CGAL/Frechet_distance/internal/curve.h
rename to Frechet_distance/include/CGAL/Frechet_distance/internal/Curve.h
index d1b48c1d119..7e1c71cfee8 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/curve.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/Curve.h
@@ -17,7 +17,7 @@
 #define CGAL_FRECHET_DISTANCE_INTERNAL_CURVE_H
 
 #include <CGAL/license/Frechet_distance.h>
-#include <CGAL/Frechet_distance/internal/id.h>
+#include <CGAL/Frechet_distance/internal/Id.h>
 
 #include <CGAL/Kernel/Type_mapper.h>
 #include <CGAL/Bbox_d.h>
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/filter.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Filter.h
similarity index 99%
rename from Frechet_distance/include/CGAL/Frechet_distance/internal/filter.h
rename to Frechet_distance/include/CGAL/Frechet_distance/internal/Filter.h
index c9fcb3f26ae..3fa3d0ac23d 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/filter.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/Filter.h
@@ -17,8 +17,8 @@
 #define CGAL_FRECHET_DISTANCE_INTERNAL_FILTER_H
 
 #include <CGAL/license/Frechet_distance.h>
-#include <CGAL/Frechet_distance/internal/certificate.h>
-#include <CGAL/Frechet_distance/internal/curve.h>
+#include <CGAL/Frechet_distance/internal/Certificate.h>
+#include <CGAL/Frechet_distance/internal/Curve.h>
 #include <CGAL/Frechet_distance/internal/geometry_basics.h>
 
 namespace CGAL {
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_classical.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_classical.h
index 2a886cd9463..beff6f5ccdd 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_classical.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_classical.h
@@ -16,7 +16,7 @@
 #ifndef CGAL_FRECHET_DISTANCE_INTERNAL_FRECHET_CLASSICAL_H
 #define CGAL_FRECHET_DISTANCE_INTERNAL_FRECHET_CLASSICAL_H
 #include <CGAL/license/Frechet_distance.h>
-#include <CGAL/Frechet_distance/internal/curve.h>
+#include <CGAL/Frechet_distance/internal/Curve.h>
 #include <CGAL/Frechet_distance/internal/geometry_basics.h>
 #include <CGAL/Frechet_distance/internal/high_level_predicates.h>
 
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_distance.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_distance.h
index 410deab68be..d43a73d49ac 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_distance.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_distance.h
@@ -16,8 +16,8 @@
 #ifndef CGAL_INTERNAL_FRECHET_DISTANCE_FRECHET_DISTANCE_H
 #define CGAL_INTERNAL_FRECHET_DISTANCE_FRECHET_DISTANCE_H
 #include <CGAL/license/Frechet_distance.h>
-#include <CGAL/Frechet_distance/internal/curve.h>
-#include <CGAL/Frechet_distance/internal/frechet_light.h>
+#include <CGAL/Frechet_distance/internal/Curve.h>
+#include <CGAL/Frechet_distance/internal/Frechet_light.h>
 #include <CGAL/Frechet_distance/internal/geometry_basics.h>
 #include <CGAL/Frechet_distance/internal/Frechet_distance_traits.h>
 #include <CGAL/STL_Extension/internal/Has_nested_type_Has_filtered_predicates_tag.h>
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/frechet_light.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_light.h
similarity index 99%
rename from Frechet_distance/include/CGAL/Frechet_distance/internal/frechet_light.h
rename to Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_light.h
index 9e82ead2682..6ad493080ad 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/frechet_light.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_light.h
@@ -17,12 +17,12 @@
 #define CGAL_FRECHET_DISTANCE_INTERNAL_FRECHET_LIGHT_H
 
 #include <CGAL/license/Frechet_distance.h>
-#include <CGAL/Frechet_distance/internal/certificate.h>
-#include <CGAL/Frechet_distance/internal/curve.h>
-#include <CGAL/Frechet_distance/internal/filter.h>
-#include <CGAL/Frechet_distance/internal/frechet_light_types.h>
+#include <CGAL/Frechet_distance/internal/Certificate.h>
+#include <CGAL/Frechet_distance/internal/Curve.h>
+#include <CGAL/Frechet_distance/internal/Filter.h>
+#include <CGAL/Frechet_distance/internal/Frechet_light_types.h>
 #include <CGAL/Frechet_distance/internal/geometry_basics.h>
-#include <CGAL/Frechet_distance/internal/id.h>
+#include <CGAL/Frechet_distance/internal/Id.h>
 #include <CGAL/Frechet_distance/internal/high_level_predicates.h>
 
 
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/frechet_light_types.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_light_types.h
similarity index 98%
rename from Frechet_distance/include/CGAL/Frechet_distance/internal/frechet_light_types.h
rename to Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_light_types.h
index a45a486ab76..49e2951a923 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/frechet_light_types.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/Frechet_light_types.h
@@ -19,9 +19,9 @@
 #include <CGAL/license/Frechet_distance.h>
 #include <vector>
 
-#include <CGAL/Frechet_distance/internal/curve.h>
+#include <CGAL/Frechet_distance/internal/Curve.h>
 #include <CGAL/Frechet_distance/internal/geometry_basics.h>
-#include <CGAL/Frechet_distance/internal/id.h>
+#include <CGAL/Frechet_distance/internal/Id.h>
 
 namespace CGAL {
 namespace Frechet_distance {
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/id.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/Id.h
similarity index 100%
rename from Frechet_distance/include/CGAL/Frechet_distance/internal/id.h
rename to Frechet_distance/include/CGAL/Frechet_distance/internal/Id.h
diff --git a/Frechet_distance/include/CGAL/Frechet_distance/internal/geometry_basics.h b/Frechet_distance/include/CGAL/Frechet_distance/internal/geometry_basics.h
index 8c54e3360b4..3504ede527a 100644
--- a/Frechet_distance/include/CGAL/Frechet_distance/internal/geometry_basics.h
+++ b/Frechet_distance/include/CGAL/Frechet_distance/internal/geometry_basics.h
@@ -29,8 +29,8 @@
 #include <CGAL/Root_of_traits.h>
 #include <CGAL/Interval_nt.h>
 
-#include <CGAL/Frechet_distance/internal/id.h>
-#include <CGAL/Frechet_distance/internal/curve.h>
+#include <CGAL/Frechet_distance/internal/Id.h>
+#include <CGAL/Frechet_distance/internal/Curve.h>
 
 namespace CGAL {
 namespace Frechet_distance {