Index: lib/libcapsicum/capsicum_helpers.h
===================================================================
--- lib/libcapsicum/capsicum_helpers.h
+++ lib/libcapsicum/capsicum_helpers.h
@@ -49,7 +49,7 @@
 	cap_rights_t rights;
 	unsigned long cmds[] = { TIOCGETA, TIOCGWINSZ };
 
-	cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_IOCTL);
+	cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_IOCTL, CAP_SEEK);
 
 	if ((flags & CAPH_READ) != 0)
 		cap_rights_set(&rights, CAP_READ);