diff --git a/posix/fd.cpp b/posix/fd.cpp
index a0229fd7..64a226b4 100644
--- a/posix/fd.cpp
+++ b/posix/fd.cpp
@@ -15,10 +15,6 @@
 #include <fcntl.h>
 #include <unistd.h>
 
-#if !defined(O_BINARY)
-#define O_BINARY 0
-#endif
-
 using cruft::posix::fd;
 
 
diff --git a/posix/fd.hpp b/posix/fd.hpp
index afbfff8b..0ac0e5dc 100644
--- a/posix/fd.hpp
+++ b/posix/fd.hpp
@@ -12,10 +12,17 @@
 #include "../debug.hpp"
 #include "../view.hpp"
 
+#include <experimental/filesystem>
+
 #include <sys/types.h>
 #include <sys/stat.h>
 
-#include <experimental/filesystem>
+#include <fcntl.h>
+
+#if !defined(O_BINARY)
+#define O_BINARY 0
+#endif
+
 
 namespace cruft::posix {
     ///------------------------------------------------------------------------