diff --git a/sbin/hastd/primary.c b/sbin/hastd/primary.c
index af0f35375669..e1f2ba4d819b 100644
--- a/sbin/hastd/primary.c
+++ b/sbin/hastd/primary.c
@@ -1687,8 +1687,11 @@ ggate_send_thread(void *arg)
 		}
 		if (ggio->gctl_error == 0 && ggio->gctl_cmd == BIO_WRITE) {
 			mtx_lock(&res->hr_amp_lock);
-			activemap_write_complete(res->hr_amp,
-			    ggio->gctl_offset, ggio->gctl_length);
+			if (activemap_write_complete(res->hr_amp,
+				ggio->gctl_offset, ggio->gctl_length)) {
+				res->hr_stat_activemap_update++;
+				(void)hast_activemap_flush(res);
+			}
 			mtx_unlock(&res->hr_amp_lock);
 		}
 		if (ggio->gctl_cmd == BIO_WRITE) {