diff --git a/configure.in b/configure.in
index c54b9f5..09bc9ad 100644
--- a/configure.in
+++ b/configure.in
@@ -15,7 +15,7 @@ dnl                 changes are made
 dnl ---
 JACK_MAJOR_VERSION=0
 JACK_MINOR_VERSION=91
-JACK_MICRO_VERSION=0
+JACK_MICRO_VERSION=1
 
 dnl ---
 dnl HOWTO: updating the jack protocal version
diff --git a/jackd/engine.c b/jackd/engine.c
index f041072..99b798b 100644
--- a/jackd/engine.c
+++ b/jackd/engine.c
@@ -643,7 +643,7 @@ jack_process_external(jack_engine_t *engine, JSList *node)
 	} else {
 		poll_timeout = (engine->control->real_time == 0 ?
 				engine->client_timeout_msecs :
-				engine->driver->period_usecs/1000);
+				1 + engine->driver->period_usecs/1000);
 	}
 
 	pfd[0].fd = client->subgraph_wait_fd;