diff --git a/configure.ac b/configure.ac
index 71d51a0b0..1295d396d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2725,6 +2725,7 @@ CheckInputKD()
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
       #include <linux/kd.h>
       #include <linux/keyboard.h>
+      #include <sys/ioctl.h>
     ]], [[
         struct kbentry kbe;
         kbe.kb_table = KG_CTRL;