diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -4213,7 +4213,7 @@
 	int res;
 	uint32_t oldval;
 
-	if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0)
+	if ((td->td_pflags & TDP_SIGFASTPENDING) == 0)
 		return;
 	res = fueword32((void *)td->td_sigblock_ptr, &oldval);
 	if (res == -1) {