diff --git a/src/flopen.c b/src/flopen.c
index b9972c9..ff20d07 100644
--- a/src/flopen.c
+++ b/src/flopen.c
@@ -32,6 +32,7 @@
 #include <sys/stat.h>
 
 #include <errno.h>
+#include <fcntl.h>
 #include <stdarg.h>
 #include <unistd.h>