diff --git a/proc/libprocfs.sym b/proc/libprocfs.sym
index d8bf6b73..eed28b17 100644
--- a/proc/libprocfs.sym
+++ b/proc/libprocfs.sym
@@ -62,6 +62,7 @@ global:
 	signal_number_to_name;
 	smp_num_cpus;
 	sprint_uptime;
+	strtosig;
 	tty_to_dev;
 	unix_print_signals;
 	uptime;
diff --git a/skill.c b/skill.c
index d19dab7c..866e8fb2 100644
--- a/skill.c
+++ b/skill.c
@@ -361,9 +361,14 @@ static void __attribute__ ((__noreturn__))
 		switch (i) {
 		case 'l':
 			if (optarg) {
-				/* FIXME */
-				errx(EXIT_FAILURE,
-				     "signal name <-> number conversion is not implemented");
+				char *s;
+				s = strtosig(optarg);
+				if (s)
+					printf("%s\n", s);
+				else
+					warnx(_("unknown signal name %s"),
+					      optarg);
+				free(s);
 			} else {
 				unix_print_signals();
 			}