diff --git a/Algorithms/DouglasPeucker.cpp b/Algorithms/douglas_peucker.cpp
similarity index 99%
rename from Algorithms/DouglasPeucker.cpp
rename to Algorithms/douglas_peucker.cpp
index 30e1da890..fdf7b2ba6 100644
--- a/Algorithms/DouglasPeucker.cpp
+++ b/Algorithms/douglas_peucker.cpp
@@ -25,7 +25,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 */
 
-#include "DouglasPeucker.h"
+#include "douglas_peucker.hpp"
 
 #include "../DataStructures/Range.h"
 #include "../DataStructures/SegmentInformation.h"
diff --git a/Algorithms/DouglasPeucker.h b/Algorithms/douglas_peucker.hpp
similarity index 96%
rename from Algorithms/DouglasPeucker.h
rename to Algorithms/douglas_peucker.hpp
index 7f624e98b..417e80a38 100644
--- a/Algorithms/DouglasPeucker.h
+++ b/Algorithms/douglas_peucker.hpp
@@ -25,8 +25,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 */
 
-#ifndef DOUGLASPEUCKER_H_
-#define DOUGLASPEUCKER_H_
+#ifndef DOUGLAS_PEUCKER_HPP_
+#define DOUGLAS_PEUCKER_HPP_
 
 #include <stack>
 #include <vector>
@@ -77,4 +77,4 @@ class DouglasPeucker
     void Run(std::vector<SegmentInformation> &input_geometry, const unsigned zoom_level);
 };
 
-#endif /* DOUGLASPEUCKER_H_ */
+#endif /* DOUGLAS_PEUCKER_HPP_ */
diff --git a/Descriptors/DescriptionFactory.h b/Descriptors/DescriptionFactory.h
index f08c13dfc..b862fa5f4 100644
--- a/Descriptors/DescriptionFactory.h
+++ b/Descriptors/DescriptionFactory.h
@@ -28,7 +28,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef DESCRIPTIONFACTORY_H_
 #define DESCRIPTIONFACTORY_H_
 
-#include "../Algorithms/DouglasPeucker.h"
+#include "../Algorithms/douglas_peucker.hpp"
 #include "../DataStructures/phantom_node.hpp"
 #include "../DataStructures/JSONContainer.h"
 #include "../DataStructures/SegmentInformation.h"