diff --git a/lib/functions.php b/lib/functions.php
index 6d6bd99..f6730af 100755
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -119,6 +119,13 @@ function writeRoutinatorExceptionFile ($roas)
 
 function writeExportJSON ($roas)
 {
+  $n = 0;
+  foreach ($roas['roas'] as $object)
+  {
+    $roas['roas'][$n]['asn'] = "AS" . $roas['roas'][$n]['asn'];
+    $n++;
+  }
+
   $json = json_encode($roas, JSON_UNESCAPED_SLASHES|JSON_PRETTY_PRINT);
 
   $fp = fopen ('roa/export_dn42.json', 'w');
diff --git a/roagen.php b/roagen.php
index cf90721..e680c2b 100755
--- a/roagen.php
+++ b/roagen.php
@@ -97,7 +97,7 @@ foreach ($raw_array as $sub_array)
     // Extract ASxxxxx from string.
     preg_match ("/AS[0-9]+/", explode (":", $asn)[1], $_asn);
 
-    $roas["roas"][$k]["asn"] = $_asn[0];
+    $roas["roas"][$k]["asn"] = trim ($_asn[0], "AS");
     $roas["roas"][$k]["prefix"] = $_prefix;
     $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV6_AS0);
     $roas["roas"][$k]["ta"] = $_ta;
@@ -187,7 +187,7 @@ foreach ($raw_array as $sub_array)
     // Extract ASxxxxx from string.
     preg_match ("/AS[0-9]+/", explode (":", $asn)[1], $_asn);
 
-    $roas["roas"][$k]["asn"] = $_asn[0];
+    $roas["roas"][$k]["asn"] = trim ($_asn[0], "AS");
     $roas["roas"][$k]["prefix"] = $_prefix;
     $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV4_AS0);
     $roas["roas"][$k]["ta"] = $_ta;