diff --git a/usr.bin/kdump/kdump.c b/usr.bin/kdump/kdump.c
--- a/usr.bin/kdump/kdump.c
+++ b/usr.bin/kdump/kdump.c
@@ -233,6 +233,11 @@
 	bool invalid;
 	int rem;
 
+	if (value == 0) {
+		printf("0");
+		return;
+	}
+
 	invalid = !print_mask_arg_part(decoder, value, &rem);
 	printf(">");
 	if (invalid)