diff --git a/src/openrct2/platform/posix.c b/src/openrct2/platform/posix.c
index 20985b617a..6778f8ef20 100644
--- a/src/openrct2/platform/posix.c
+++ b/src/openrct2/platform/posix.c
@@ -19,6 +19,7 @@
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <fnmatch.h>
 #include <fts.h>
 #include <libgen.h>