diff --git a/LSL2/STPROC/RDS_SERVICES.txt b/LSL2/STPROC/RDS_SERVICES.txt
index 0474940..144c9e3 100644
--- a/LSL2/STPROC/RDS_SERVICES.txt
+++ b/LSL2/STPROC/RDS_SERVICES.txt
@@ -1818,6 +1818,7 @@ Service DetachRDSFromWO(RDSNo)
         RDSRec = Database_Services('ReadDataRow', 'RDS', RDSNo)
         if Error_Services('NoError') then
             RDSRec<RDS_WO$> = ''
+            RDSRec<RDS_WO_STEP_KEY$> = ''
             Database_Services('WriteDataRow', 'RDS', RDSNo, RDSRec, False$, False$, False$)
             If Error_Services('HasError') then
                 ErrorMessage = Error_Services('GetMessage')
@@ -1857,3 +1858,4 @@ return
 
 
 
+