diff --git a/Modules/termios.c b/Modules/termios.c
index 054d2599370..0bce7d3fd0a 100644
--- a/Modules/termios.c
+++ b/Modules/termios.c
@@ -5,6 +5,7 @@
 #define PyInit_termios inittermios
 
 #include <termios.h>
+#include <sys/ioctl.h>
 
 static char termios__doc__[] = "\
 This module provides an interface to the Posix calls for tty I/O control.\n\