diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index 395432a56..c4aa75b4b 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -1670,6 +1670,7 @@ static void thread_func(void *userdata) {
 
                 u->first = TRUE;
                 u->since_start = 0;
+                revents = 0;
             } else if (revents && u->use_tsched && pa_log_ratelimit(PA_LOG_DEBUG))
                 pa_log_debug("Wakeup from ALSA!");
 
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index bdd4493da..1dd63f0d6 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -1445,6 +1445,7 @@ static void thread_func(void *userdata) {
                     goto fail;
 
                 u->first = TRUE;
+                revents = 0;
             } else if (revents && u->use_tsched && pa_log_ratelimit(PA_LOG_DEBUG))
                 pa_log_debug("Wakeup from ALSA!");