diff --git a/arpwatch-2.1a15-dropgroup.patch b/arpwatch-2.1a15-dropgroup.patch
new file mode 100644
index 0000000..b6a25f8
--- /dev/null
+++ b/arpwatch-2.1a15-dropgroup.patch
@@ -0,0 +1,12 @@
+diff -up arpwatch-2.1a15/arpwatch.c.dropgroup arpwatch-2.1a15/arpwatch.c
+--- arpwatch-2.1a15/arpwatch.c.dropgroup	2012-05-31 11:47:13.327901902 +0200
++++ arpwatch-2.1a15/arpwatch.c	2012-05-31 11:48:04.859900061 +0200
+@@ -147,7 +147,7 @@ void dropprivileges(const char* user)
+ 	struct passwd* pw;
+ 	pw = getpwnam( user );
+ 	if ( pw ) {
+-		if ( initgroups(pw->pw_name, NULL) != 0 || setgid(pw->pw_gid) != 0 ||
++		if ( setgid(pw->pw_gid) != 0 || setgroups(0, NULL) != 0 ||
+ 				 setuid(pw->pw_uid) != 0 ) {
+ 			syslog(LOG_ERR, "Couldn't change to '%.32s' uid=%d gid=%d", user,
+ 						 pw->pw_uid, pw->pw_gid);