diff --git a/fhem/contrib/DS_Starter/76_SolarForecast.pm b/fhem/contrib/DS_Starter/76_SolarForecast.pm
index 95ab3a9d3..762b60b54 100644
--- a/fhem/contrib/DS_Starter/76_SolarForecast.pm
+++ b/fhem/contrib/DS_Starter/76_SolarForecast.pm
@@ -1154,6 +1154,7 @@ sub centralTask {
   deleteReadingspec ($hash, "Today_PV");
   deleteReadingspec ($hash, "Tomorrow_PV");
   deleteReadingspec ($hash, "NextHour.*");
+  deleteReadingspec ($hash, "moduleEfficiency");
 
   my $interval = controlParams ($name);