diff --git a/include/os/os.h b/include/os/os.h
index 16ba191c26..500375adf2 100644
--- a/include/os/os.h
+++ b/include/os/os.h
@@ -24,10 +24,12 @@ extern "C" {
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <float.h>
 #include <inttypes.h>
 #include <locale.h>
 #include <math.h>
+#include <regex.h>
 #include <sched.h>
 #include <setjmp.h>
 #include <signal.h>
@@ -44,7 +46,6 @@ extern "C" {
 #include <unistd.h>
 #include <wchar.h>
 #include <wctype.h>
-#include <regex.h>
 #include <wordexp.h>
 
 #include <sys/mman.h>