diff --git a/sys/dev/vt/vt.h b/sys/dev/vt/vt.h
--- a/sys/dev/vt/vt.h
+++ b/sys/dev/vt/vt.h
@@ -81,7 +81,6 @@
 #else
 #define	DPRINTF(_l, ...)	do {} while (0)
 #endif
-#define	ISSIGVALID(sig)	((sig) > 0 && (sig) < NSIG)
 
 #define	VT_SYSCTL_INT(_name, _default, _descr)				\
 int vt_##_name = (_default);						\
diff --git a/sys/dev/vt/vt_core.c b/sys/dev/vt/vt_core.c
--- a/sys/dev/vt/vt_core.c
+++ b/sys/dev/vt/vt_core.c
@@ -3046,9 +3046,9 @@
 				DPRINTF(5, "reset WAIT_ACQ, ");
 			return (0);
 		} else if (mode->mode == VT_PROCESS) {
-			if (!(ISSIGVALID(mode->relsig) &&
-			    ISSIGVALID(mode->acqsig) &&
-			    (mode->frsig == 0 || ISSIGVALID(mode->frsig)))) {
+			if (!(_SIG_VALID(mode->relsig) &&
+			    _SIG_VALID(mode->acqsig) &&
+			    (mode->frsig == 0 || _SIG_VALID(mode->frsig)))) {
 				DPRINTF(5, "error EINVAL\n");
 				return (EINVAL);
 			}