diff --git a/devices/geiger/gqgmc.go b/devices/geiger/gqgmc.go
index 08b04d7cfa702b022df0233a7e71f995b2fae466..54141870634946d645a830b15069bd34efc42912 100644
--- a/devices/geiger/gqgmc.go
+++ b/devices/geiger/gqgmc.go
@@ -307,7 +307,7 @@ func (gc *GQGMCCounter) GetConfiguration() (*DevConfig, error) {
 		return nil, err
 	}
 	var cfg DevConfig
-	restruct.Unpack(data[:58], binary.BigEndian, &cfg)
+	restruct.Unpack(data[:59], binary.BigEndian, &cfg)
 	fmt.Printf("Configuration: %+v\n", data)
 	return &cfg, nil
 }