diff --git a/src/sound.cpp b/src/sound.cpp
--- a/src/sound.cpp
+++ b/src/sound.cpp
@@ -282,8 +282,8 @@ INSTANTIATE_BASE_MEDIA_METHODS(BaseMedia
 static const char * const _sound_file_names[] = { "samples" };
 
 
-template <class T, size_t Tnum_files>
-/* static */ const char * const *BaseSet<T, Tnum_files>::file_names = _sound_file_names;
+template <class T, size_t Tnum_files, Subdirectory Tsubdir>
+/* static */ const char * const *BaseSet<T, Tnum_files, Tsubdir>::file_names = _sound_file_names;
 
 template <class Tbase_set>
 /* static */ const char *BaseMedia<Tbase_set>::GetExtension()