diff --git a/substrate/fd b/substrate/fd
index 8f376ba..7f60b7e 100644
--- a/substrate/fd
+++ b/substrate/fd
@@ -2,10 +2,7 @@
 #ifndef SUBSTRATE_FD
 #define SUBSTRATE_FD
 
-#include <array>
-#include <memory>
 #include <string>
-#include <type_traits>
 #include <utility>
 #if __cplusplus >= 201703L
 #include <string_view>