diff --git a/lib/xmet/bufr.py b/lib/xmet/bufr.py
index 25099fb..2e78b39 100644
--- a/lib/xmet/bufr.py
+++ b/lib/xmet/bufr.py
@@ -11,6 +11,8 @@ from xmet.units    import celsius
 class BUFRSounding(Sounding):
     EDEX_HOST = 'edex-cloud.unidata.ucar.edu'
 
+    BUFR_SOURCE = 'UCAR'
+
     BUFR_TYPE        = 'bufrua'
     BUFR_PARAMS_MAN  = set(['prMan', 'htMan', 'wdMan', 'wsMan'])
     BUFR_PARAMS_SIGT = set(['prSigT', 'htSigT', 'tpSigT', 'tdSigT'])
@@ -108,8 +110,8 @@ class BUFRSounding(Sounding):
         timestamp = datetime.datetime.fromtimestamp(epoch, datetime.UTC)
 
         sounding.station              = response[0].getLocationName()
-        sounding.data_source_pressure = 'UCAR'
-        sounding.data_source_other    = 'UCAR'
+        sounding.data_source_pressure = BUFRSounding.BUFR_SOURCE
+        sounding.data_source_other    = BUFRSounding.BUFR_SOURCE
         sounding.location             = shapely.Point(geom.x, geom.y)
 
         sounding.timestamp_observed = timestamp