--- /dev/null
+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);