diff --git a/capi20/capi_mod_std.c b/capi20/capi_mod_std.c
index 54863bce..75e22c97 100644
--- a/capi20/capi_mod_std.c
+++ b/capi20/capi_mod_std.c
@@ -16,6 +16,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdarg.h>
+#include <sys/ioctl.h>
 #include <linux/capi.h>
 #include <unistd.h>
 #include "capi20.h"