diff --git a/fhem/CHANGED b/fhem/CHANGED
index b2be0c74f..bf1873078 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,6 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it.
+ - change:  10_WS980: fix num vs. string
  - change:  55_DWD_OpenData: logging (forum #83097 msg #1114070)
  - feature: 74_Unifi: get deviceData hinzugefügt
  - feature: 74_UnifiSwitch: new setter portProfile
diff --git a/fhem/FHEM/10_WS980.pm b/fhem/FHEM/10_WS980.pm
index be8dcd67f..db3235779 100644
--- a/fhem/FHEM/10_WS980.pm
+++ b/fhem/FHEM/10_WS980.pm
@@ -33,7 +33,7 @@ use warnings;
 use IO::Socket::INET;
 use POSIX qw(strftime);
 
-my $version = "1.2.0";
+my $version = "1.2.1";
 
 #------------------------------------------------------------------------------------------------------
 # global constants
@@ -1006,10 +1006,10 @@ sub WS980_updateRelPressure($)
 	}
 
 	my $relPressure = WS980_calculateRelPressure_QFF(
-		ReadingsVal($name, "temperature", 0.0),
-		ReadingsVal($name, "pressureAbs", 0.0),
+		ReadingsNum($name, "temperature", 0.0),
+		ReadingsNum($name, "pressureAbs", 0.0),
 		$altitude,
-		ReadingsVal($name, "humidity", 0.0));
+		ReadingsNum($name, "humidity", 0.0));
 
 	readingsSingleUpdate($hash, "pressureRel_calculated", sprintf("%.1f", $relPressure), 1);
 }