diff --git a/src/linux/up-backend.c b/src/linux/up-backend.c
index aa6f33b..021b36f 100644
--- a/src/linux/up-backend.c
+++ b/src/linux/up-backend.c
@@ -480,7 +480,8 @@ out:
 /**
  * up_backend_get_used_swap:
  *
- * Return value: a percentage value
+ * Return value: a percentage value how much of the available swap memory would
+ * be taken by currently active memory
  **/
 gfloat
 up_backend_get_used_swap (UpBackend *backend)
diff --git a/src/up-daemon.c b/src/up-daemon.c
index c6cf755..d2f9677 100644
--- a/src/up-daemon.c
+++ b/src/up-daemon.c
@@ -105,9 +105,9 @@ G_DEFINE_TYPE (UpDaemon, up_daemon, G_TYPE_OBJECT)
 
 /* if using more memory compared to usable swap, disable hibernate */
 /* Native Linux suspend-to-disk does not use compression, and needs 2 KB of
- * page meta information for each MB of active memory. Add an extra .05% to
- * prevent rounding errors. */
-#define UP_DAEMON_SWAP_WATERLINE 			100.25f /* % */
+ * page meta information for each MB of active memory. Add some error margin
+ * here, though. */
+#define UP_DAEMON_SWAP_WATERLINE 			98f /* % */
 
 /* refresh all the devices after this much time when on-battery has changed */
 #define UP_DAEMON_ON_BATTERY_REFRESH_DEVICES_DELAY	1 /* seconds */