diff -u -r ../procps-ng-3.3.11/pgrep.c ./pgrep.c
--- ../procps-ng-3.3.11/pgrep.c	2015-08-09 01:54:54.298117295 -0400
+++ ./pgrep.c	2016-04-12 01:14:09.647108539 -0400
@@ -713,7 +713,7 @@
 		{NULL, 0, NULL, 0}
 	};
 
-	if (strstr (program_invocation_short_name, "pkill")) {
+	if (strstr (argv[0], "pkill")) {
 		int sig;
 		i_am_pkill = 1;
 		sig = signal_option(&argc, argv);