diff --git a/libc/include/fcntl.h b/libc/include/fcntl.h
index 0f09a15d..e9f9bd4d 100644
--- a/libc/include/fcntl.h
+++ b/libc/include/fcntl.h
@@ -4,6 +4,7 @@
 #define _FCNTL_H
 
 #include <bits/open-flags.h>
+#include <sys/types.h>
 
 #ifdef __cplusplus
 extern "C"