diff --git a/reactos/tools/widl/write_msft.c b/reactos/tools/widl/write_msft.c
index 47cc8be54ba..c9ae86ab24e 100644
--- a/reactos/tools/widl/write_msft.c
+++ b/reactos/tools/widl/write_msft.c
@@ -35,6 +35,9 @@
 #include <time.h>
 #ifdef WIN32
 #include <io.h> /* write() */
+#else
+#include <fcntl.h> /* create */
+#include <unistd.h> /* write and close */
 #endif /* WIN32 */
 
 #define NONAMELESSUNION