Index: head/lib/libcapsicum/capsicum_helpers.h
===================================================================
--- head/lib/libcapsicum/capsicum_helpers.h
+++ head/lib/libcapsicum/capsicum_helpers.h
@@ -31,6 +31,7 @@
 
 #include <sys/param.h>
 #include <sys/capsicum.h>
+#include <sys/ioctl.h>
 
 #include <errno.h>
 #include <nl_types.h>
@@ -47,7 +48,7 @@
 caph_limit_stream(int fd, int flags)
 {
 	cap_rights_t rights;
-	unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ };
+	unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ, FIODTYPE };
 
 	cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_IOCTL);