diff --git a/src/defer.hpp b/src/defer.h
similarity index 100%
rename from src/defer.hpp
rename to src/defer.h
diff --git a/src/prof.hpp b/src/prof.h
similarity index 100%
rename from src/prof.hpp
rename to src/prof.h
diff --git a/src/rntviewer.cpp b/src/rntviewer.cpp
index f3dca3b..8290d3c 100644
--- a/src/rntviewer.cpp
+++ b/src/rntviewer.cpp
@@ -51,8 +51,8 @@
 #include "root/RMicroFileReader.hxx"
 
 #include "types.h"
-#include "defer.hpp"
-#include "prof.hpp"
+#include "defer.h"
+#include "prof.h"
 #include "mem.h"
 #include "str.h"
 #include "rntuple.h"