diff --git a/py25/bacpypes/apdu.py b/py25/bacpypes/apdu.py
index 3f031ab..c2510d5 100755
--- a/py25/bacpypes/apdu.py
+++ b/py25/bacpypes/apdu.py
@@ -1302,8 +1302,8 @@ class SubscribeCOVRequest(ConfirmedRequestSequence):
     sequenceElements = \
         [ Element('subscriberProcessIdentifier', Unsigned, 0)
         , Element('monitoredObjectIdentifier', ObjectIdentifier, 1)
-        , Element('issueConfirmedNotifications', Boolean, 2)
-        , Element('lifetime', Unsigned, 3)
+        , Element('issueConfirmedNotifications', Boolean, 2, True)
+        , Element('lifetime', Unsigned, 3, True)
         ]
 
 register_confirmed_request_type(SubscribeCOVRequest)
diff --git a/py27/bacpypes/apdu.py b/py27/bacpypes/apdu.py
index a38461b..eb81f5e 100755
--- a/py27/bacpypes/apdu.py
+++ b/py27/bacpypes/apdu.py
@@ -1295,8 +1295,8 @@ class SubscribeCOVRequest(ConfirmedRequestSequence):
     sequenceElements = \
         [ Element('subscriberProcessIdentifier', Unsigned, 0)
         , Element('monitoredObjectIdentifier', ObjectIdentifier, 1)
-        , Element('issueConfirmedNotifications', Boolean, 2)
-        , Element('lifetime', Unsigned, 3)
+        , Element('issueConfirmedNotifications', Boolean, 2, True)
+        , Element('lifetime', Unsigned, 3, True)
         ]
 
 register_confirmed_request_type(SubscribeCOVRequest)
diff --git a/py34/bacpypes/apdu.py b/py34/bacpypes/apdu.py
index fc345b4..09b0391 100755
--- a/py34/bacpypes/apdu.py
+++ b/py34/bacpypes/apdu.py
@@ -1294,8 +1294,8 @@ class SubscribeCOVRequest(ConfirmedRequestSequence):
     sequenceElements = \
         [ Element('subscriberProcessIdentifier', Unsigned, 0)
         , Element('monitoredObjectIdentifier', ObjectIdentifier, 1)
-        , Element('issueConfirmedNotifications', Boolean, 2)
-        , Element('lifetime', Unsigned, 3)
+        , Element('issueConfirmedNotifications', Boolean, 2, True)
+        , Element('lifetime', Unsigned, 3, True)
         ]
 
 register_confirmed_request_type(SubscribeCOVRequest)