diff --git a/sensorhub-service-consys/src/main/java/org/sensorhub/impl/service/consys/obs/ObsHandler.java b/sensorhub-service-consys/src/main/java/org/sensorhub/impl/service/consys/obs/ObsHandler.java
index 7be1c044f..e1c9a79fe 100644
--- a/sensorhub-service-consys/src/main/java/org/sensorhub/impl/service/consys/obs/ObsHandler.java
+++ b/sensorhub-service-consys/src/main/java/org/sensorhub/impl/service/consys/obs/ObsHandler.java
@@ -527,8 +527,24 @@ protected BigId addEntry(RequestContext ctx, IObsData res) throws DataStoreExcep
             throw new DataStoreException("Invalid FOI ID");
         }
     }
-    
-    
+
+    @Override
+    protected boolean updateEntry(RequestContext ctx, BigId key, IObsData res) throws DataStoreException {
+        // Don't allow insertion with PUT
+        if(db.getObservationStore().get(key) == null)
+            return false;
+
+        try
+        {
+            db.getObservationStore().put(key, res);
+            return true;
+        }
+        catch (IllegalArgumentException e)
+        {
+            throw new DataStoreException(e.getMessage());
+        }
+    }
+
     @Override
     protected boolean deleteEntry(final RequestContext ctx, final BigId key) throws DataStoreException
     {