I had to do it ...

conntrack.c

diff --git a/src/conntrack.c b/src/conntrack.c
index 5364eaa..2e3d654 100644
--- a/src/conntrack.c
+++ b/src/conntrack.c
@@ -548,7 +548,7 @@ extension_help(struct ctproto_handler *h, int protonum)
 static void __attribute__((noreturn))
 exit_tryhelp(int status)
 {
-       fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
+       fprintf(stderr, "Try `%s -h' or `%s --help' for more information.\n",
                        PROGNAME, PROGNAME);
        exit(status);
 }