diff --git a/dlls/ntdll/file.c b/dlls/ntdll/file.c
index 5d397cc1339..4e646cb408c 100644
--- a/dlls/ntdll/file.c
+++ b/dlls/ntdll/file.c
@@ -42,6 +42,9 @@
 #ifdef HAVE_SYS_TIME_H
 # include <sys/time.h>
 #endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
 #ifdef HAVE_POLL_H
 #include <poll.h>
 #endif