diff --git a/src/bacnet/basic/object/ms-input.c b/src/bacnet/basic/object/ms-input.c
index 5000f5cb..e1ad3bca 100644
--- a/src/bacnet/basic/object/ms-input.c
+++ b/src/bacnet/basic/object/ms-input.c
@@ -53,8 +53,8 @@ static const int Properties_Required[] = {
     PROP_OUT_OF_SERVICE,    PROP_NUMBER_OF_STATES, -1
 };
 
-static const int Properties_Optional[] = { PROP_DESCRIPTION, PROP_STATE_TEXT,
-                                           -1 };
+static const int Properties_Optional[] = { PROP_DESCRIPTION, PROP_RELIABILITY,
+                                           PROP_STATE_TEXT, -1 };
 
 static const int Properties_Proprietary[] = { -1 };
 
diff --git a/src/bacnet/basic/object/msv.c b/src/bacnet/basic/object/msv.c
index 9ea57df5..948b5802 100644
--- a/src/bacnet/basic/object/msv.c
+++ b/src/bacnet/basic/object/msv.c
@@ -53,8 +53,8 @@ static const int Properties_Required[] = {
     PROP_OUT_OF_SERVICE,    PROP_NUMBER_OF_STATES, -1
 };
 
-static const int Properties_Optional[] = { PROP_DESCRIPTION, PROP_STATE_TEXT,
-                                           -1 };
+static const int Properties_Optional[] = { PROP_DESCRIPTION, PROP_RELIABILITY,
+                                           PROP_STATE_TEXT, -1 };
 
 static const int Properties_Proprietary[] = { -1 };