diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4df6606..c21533f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,7 +47,7 @@ set(sdcv_SRCS
   src/lib/dictziplib.cpp
   src/lib/dictziplib.hpp  
   src/lib/distance.cpp 
-  src/lib/distance.h
+  src/lib/distance.hpp
   src/lib/mapfile.hpp
   src/lib/file.hpp
   src/lib/file.cpp
diff --git a/src/lib/distance.cpp b/src/lib/distance.cpp
index eb1a83c..1c9ae7f 100644
--- a/src/lib/distance.cpp
+++ b/src/lib/distance.cpp
@@ -37,7 +37,7 @@ The Levenshtein distance algorithm has been used in:
 #include <cstdlib>
 #include <cstring>
 
-#include "distance.h"
+#include "distance.hpp"
 
 /*
 Cover transposition, in addition to deletion,
diff --git a/src/lib/distance.h b/src/lib/distance.hpp
similarity index 100%
rename from src/lib/distance.h
rename to src/lib/distance.hpp
diff --git a/src/lib/lib.cpp b/src/lib/lib.cpp
index 1aaaf68..c7d3b2f 100644
--- a/src/lib/lib.cpp
+++ b/src/lib/lib.cpp
@@ -10,7 +10,7 @@
 #include <zlib.h>
 #include <glib/gstdio.h>
 
-#include "distance.h"
+#include "distance.hpp"
 #include "file.hpp"
 #include "mapfile.hpp"