diff --git a/libs/audio/include/psemek/audio/engine.hpp b/libs/audio/include/psemek/audio/engine.hpp
index f53fd4e6..73128876 100644
--- a/libs/audio/include/psemek/audio/engine.hpp
+++ b/libs/audio/include/psemek/audio/engine.hpp
@@ -12,6 +12,9 @@ namespace psemek::audio
 
 	struct engine
 	{
+		static const int frequency = 44100;
+		static const int channels = 2;
+
 		engine();
 		~engine();
 
diff --git a/libs/audio/source/engine.cpp b/libs/audio/source/engine.cpp
index b1258ffb..c5f2cc19 100644
--- a/libs/audio/source/engine.cpp
+++ b/libs/audio/source/engine.cpp
@@ -15,8 +15,6 @@ namespace psemek::audio
 	namespace
 	{
 
-		static const int frequency = 44100;
-
 		[[noreturn]] void mix_fail(std::string const & message)
 		{
 			throw std::runtime_error(message + Mix_GetError());