diff --git a/pgrep.c b/pgrep.c
index e1a7c831..ed2f02c0 100644
--- a/pgrep.c
+++ b/pgrep.c
@@ -609,8 +609,6 @@ static int signal_option(int *argc, char **argv)
     for (i = 1; i < *argc; i++) {
         if (argv[i][0] == '-') {
             sig = signal_name_to_number(argv[i] + 1);
-            if (sig == -1 && isdigit(argv[i][1]))
-                sig = atoi(argv[i] + 1);
             if (-1 < sig) {
                 memmove(argv + i, argv + i + 1,
                     sizeof(char *) * (*argc - i));