diff --git a/src/applets/battery.c b/src/applets/battery.c
index dc78cff..db65efa 100644
--- a/src/applets/battery.c
+++ b/src/applets/battery.c
@@ -216,6 +216,8 @@ static int _timeout_tre(int fd, int sensor, envsys_tre_data_t * tre)
 #else
 static gboolean _on_timeout(gpointer data)
 {
+	Battery * battery = data;
+
 	/* XXX should show uncertain state instead of a full battery */
 	_battery_set(battery, 100.0);
 	return FALSE;