diff --git a/smartapps/opent2t/opent2t-smartapp-test.src/opent2t-smartapp-test.groovy b/smartapps/opent2t/opent2t-smartapp-test.src/opent2t-smartapp-test.groovy
index 6825333..1d3da41 100644
--- a/smartapps/opent2t/opent2t-smartapp-test.src/opent2t-smartapp-test.groovy
+++ b/smartapps/opent2t/opent2t-smartapp-test.src/opent2t-smartapp-test.groovy
@@ -190,7 +190,10 @@ def registerDeviceChange() {
 				state.deviceSubscriptionMap.put(deviceId, [subscriptionEndpt])
 				log.info "Added subscription URL: ${subscriptionEndpt} for ${myDevice.displayName}"
 			} else if (!state.deviceSubscriptionMap[deviceId].contains(subscriptionEndpt)){
-				state.deviceSubscriptionMap[deviceId] << subscriptionEndpt
+				// state.deviceSubscriptionMap[deviceId] << subscriptionEndpt
+                // For now, we will only have one subscription endpoint per device
+				state.deviceSubscriptionMap.remove(deviceId)
+				state.deviceSubscriptionMap.put(deviceId, [subscriptionEndpt])
 				log.info "Added subscription URL: ${subscriptionEndpt} for ${myDevice.displayName}"
 			}