diff --git a/libc/include/sys/ioctl.h b/libc/include/sys/ioctl.h
index 9f68510..49d452c 100644
--- a/libc/include/sys/ioctl.h
+++ b/libc/include/sys/ioctl.h
@@ -30,6 +30,11 @@
 
 #include <sys/cdefs.h>
 #include <linux/ioctl.h>
+/*
+ * NetBSD and glibc's <sys/ioctl.h> provide some of the
+ * terminal-related ioctl data structures such as struct winsize.
+ */
+#include <linux/termios.h>
 #include <asm/ioctls.h>
 #include <asm/termbits.h>
 #include <sys/ioctl_compat.h>