diff --git a/gmid.c b/gmid.c
index 0e7918b..4908c7b 100644
--- a/gmid.c
+++ b/gmid.c
@@ -296,9 +296,10 @@ drop_priv(void)
 	}
 
 	if (pw != NULL) {
-		if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
-			fatal("setresuid(%d): %s", pw->pw_uid,
-			    strerror(errno));
+		if (setgroups(1, &pw->pw_gid) == -1 ||
+		    setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1 ||
+		    setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
+			fatal("cannot drop privileges");
 	}
 
 	if (getuid() == 0)