diff --git a/social/pushover/57-pushover.js b/social/pushover/57-pushover.js
index 3a77bbd7..2cd9e83e 100644
--- a/social/pushover/57-pushover.js
+++ b/social/pushover/57-pushover.js
@@ -63,9 +63,11 @@ module.exports = function(RED) {
                 expire = 10800;
                 node.warn("Expire time too high, using maximum setting of 10800s (3 hours) retry duration");
             }
-            if (!Number.isInteger(ttl) || ttl<=0) {
-                ttl = null;
-                node.warn("No valid number for TTL found, not set");
+            if (ttl !== null) {
+                if(!Number.isInteger(ttl) || ttl <= 0) {
+                    ttl = null;
+                    node.warn("No valid number for TTL found, not set");
+                }
             }
             if (typeof msg.payload === 'undefined') { msg.payload = "(undefined msg.payload)"; }
             if (typeof(msg.payload) === 'object') {