diff --git a/backends/fs/posix/posix-fs.cpp b/backends/fs/posix/posix-fs.cpp
index d388f306fdb..b38a07637c3 100644
--- a/backends/fs/posix/posix-fs.cpp
+++ b/backends/fs/posix/posix-fs.cpp
@@ -39,6 +39,7 @@
 #include <dirent.h>
 #include <stdio.h>
 #include <errno.h>
+#include <fcntl.h>
 
 #ifdef __OS2__
 #define INCL_DOS