--- src/data-fd.c
+++ src/data-fd.c
@@ -28,6 +28,9 @@
 #ifdef HAVE_SYS_TYPES_H
 # include <sys/types.h>
 #endif
+#if defined HAVE_W32_SYSTEM
+#include <io.h>
+#endif
 
 #include "debug.h"
 #include "data.h"
--- src/gpgme-w32spawn.c
+++ src/gpgme-w32spawn.c
@@ -36,6 +36,7 @@
 # include <sys/stat.h>
 #endif
 #include <stdint.h>
+#include <io.h>
 #include <process.h>
 
 #include "priv-io.h"