diff --git a/UnitTests/Algorithms/DouglasPeuckerTest.cpp b/UnitTests/Algorithms/DouglasPeuckerTest.cpp
index 76f0ba38c..2c0c54e98 100644
--- a/UnitTests/Algorithms/DouglasPeuckerTest.cpp
+++ b/UnitTests/Algorithms/DouglasPeuckerTest.cpp
@@ -1,4 +1,4 @@
-#include "../../Algorithms/DouglasPeucker.h"
+#include "../../Algorithms/douglas_peucker.hpp"
 #include "../../DataStructures/SegmentInformation.h"
 #include "../../Include/osrm/Coordinate.h"