diff --git a/audio/ess/decOgg.cpp b/audio/ess/decOgg.cpp
index f2d720f..b331891 100644
--- a/audio/ess/decOgg.cpp
+++ b/audio/ess/decOgg.cpp
@@ -8,8 +8,8 @@
 #include <etk/os/FSNode.hpp>
 #include <audio/ess/debug.hpp>
 #include <audio/ess/decOgg.hpp>
-#include <tremor/ivorbiscodec.hpp>
-#include <tremor/ivorbisfile.hpp>
+#include <tremor/ivorbiscodec.h>
+#include <tremor/ivorbisfile.h>
 #include <memory>
 
 
diff --git a/doc/tutorial.md b/doc/tutorial.md
index bf1d63d..5c3c8b1 100644
--- a/doc/tutorial.md
+++ b/doc/tutorial.md
@@ -41,7 +41,7 @@ what you need to do first:                          {#audio_ess_tuto_include}
 
 Include and basic init:
 ```{.cpp}
-#include <audio/ess/ess.h>
+#include <audio/ess/ess.hpp>
 
 //in the main application:
 int main(...) {
diff --git a/lutin_audio-ess.py b/lutin_audio-ess.py
index ff2985f..f6fd9d7 100644
--- a/lutin_audio-ess.py
+++ b/lutin_audio-ess.py
@@ -38,10 +38,10 @@ def create(target, module_name):
 		'audio/ess/LoadedFile.cpp'
 		])
 	my_module.add_header_file([
-		'audio/ess/effects.h',
-		'audio/ess/ess.h',
-		'audio/ess/music.h',
-		'audio/ess/LoadedFile.h'
+		'audio/ess/effects.hpp',
+		'audio/ess/ess.hpp',
+		'audio/ess/music.hpp',
+		'audio/ess/LoadedFile.hpp'
 		])
 	# name of the dependency
 	my_module.add_depend(['etk', 'audio-river', 'ogg', 'ejson'])