diff --git a/posix/unixint.lisp b/posix/unixint.lisp
index 7349350ea9abf93b76b8bf8bbf2ad43d52ed4a90..b7e4c7d60bdcf0d28c0f328ca7f0b0fd61e4fd7e 100644
--- a/posix/unixint.lisp
+++ b/posix/unixint.lisp
@@ -546,6 +546,7 @@
 (constant (cflag-VSWTC "VSWTC"))
 (constant (cflag-VSTART "VSTART"))
 (constant (cflag-VSTOP "VSTOP"))
+(constant (cflag-VDSUSP "VDSUSP"))
 (constant (cflag-VSUSP "VSUSP"))
 (constant (cflag-VEOL "VEOL"))
 (constant (cflag-VREPRINT "VREPRINT"))