diff --git a/doc/demo.sh b/doc/demo.sh
index c7d2eac..83f9e78 100755
--- a/doc/demo.sh
+++ b/doc/demo.sh
@@ -115,4 +115,4 @@ echo
 echo "Starting passt..."
 echo
 
-ip netns exec "${ns}" ./passt
+ip netns exec "${ns}" ./passt | cat
diff --git a/passt.c b/passt.c
index a057d46..3637e48 100644
--- a/passt.c
+++ b/passt.c
@@ -797,7 +797,7 @@ int main(int argc, char **argv)
 #if DEBUG
 	openlog("passt", LOG_PERROR, LOG_DAEMON);
 #else
-	openlog("passt", 0, LOG_DAEMON);
+	openlog("passt", isatty(fileno(stdout)) ? 0 : LOG_PERROR, LOG_DAEMON);
 #endif
 
 	get_routes(&c);
@@ -870,7 +870,7 @@ listen:
 	     " -net nic,model=virtio", sock_index);
 
 #ifndef DEBUG
-	if (daemon(0, 0)) {
+	if (isatty(fileno(stdout)) && daemon(0, 0)) {
 		fprintf(stderr, "Failed to fork into background\n");
 		exit(EXIT_FAILURE);
 	}