diff --git a/LibreNMS/Alert/Transport/Api.php b/LibreNMS/Alert/Transport/Api.php
index 0a1b0bde32..b138a3f911 100644
--- a/LibreNMS/Alert/Transport/Api.php
+++ b/LibreNMS/Alert/Transport/Api.php
@@ -44,6 +44,9 @@ class Api implements Transport
                 curl_setopt($curl, CURLOPT_URL, ($method == "get" ? $host."?".$api : $host));
                 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
                 curl_setopt($curl, CURLOPT_CUSTOMREQUEST, strtoupper($method));
+                if (json_decode($api) !== null) {
+                    curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-type: application/json"));
+                }
                 curl_setopt($curl, CURLOPT_POSTFIELDS, $api);
                 $ret = curl_exec($curl);
                 $code = curl_getinfo($curl, CURLINFO_HTTP_CODE);