diff --git a/Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d.C b/Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d.cpp
similarity index 100%
rename from Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d.C
rename to Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d.cpp
diff --git a/Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d_fast_exact.C b/Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d_fast_exact.cpp
similarity index 100%
rename from Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d_fast_exact.C
rename to Polytope_distance_d/examples/Polytope_distance_d/polytope_distance_d_fast_exact.cpp