diff --git a/SDL2pp/Optional.hh b/SDL2pp/Optional.hh
index 8641d1b..3c647c8 100644
--- a/SDL2pp/Optional.hh
+++ b/SDL2pp/Optional.hh
@@ -22,7 +22,7 @@
 #ifndef SDL2PP_OPTIONAL_HH
 #define SDL2PP_OPTIONAL_HH
 
-#include <SDL2pp/libcpp_optional.hh>
+#include <SDL2pp/external/libcpp_optional.hh>
 
 namespace SDL2pp {
 
diff --git a/SDL2pp/libcpp_optional.hh b/SDL2pp/external/libcpp_optional.hh
similarity index 100%
rename from SDL2pp/libcpp_optional.hh
rename to SDL2pp/external/libcpp_optional.hh