diff --git a/rfc8416.php b/rfc8416.php
index b03bad7..47bbc93 100755
--- a/rfc8416.php
+++ b/rfc8416.php
@@ -111,7 +111,7 @@ foreach ($raw_array as $sub_array)
     
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["asn"] = trim ($_asn[0], "AS");
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["prefix"] = $_prefix;
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = $_maxlength;
+    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = ($_asn[0] != "AS0" ? $_maxlength : 128);
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["comment"] = "$web_registry_url/data/inet6num/$prefix[1]_$prefix[2]";
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["source"] = "$_ta";
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["mnt-by"] = "$_mnt";
@@ -212,7 +212,7 @@ foreach ($raw_array as $sub_array)
     
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["asn"] = trim ($_asn[0], "AS");
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["prefix"] = $_prefix;
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = $_maxlength;
+    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = ($_asn[0] != "AS0" ? $_maxlength : 32);
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["comment"] = "$web_registry_url/data/inetnum/$prefix[1]_$prefix[2]";
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["source"] = "$_ta";
     $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["mnt-by"] = "$_mnt";
diff --git a/roagen.php b/roagen.php
index acf1b55..d818826 100755
--- a/roagen.php
+++ b/roagen.php
@@ -97,7 +97,7 @@ foreach ($raw_array as $sub_array)
 
     $roas["roas"][$k]["asn"] = $_asn[0];
     $roas["roas"][$k]["prefix"] = $_prefix;
-    $roas["roas"][$k]["maxLength"] = $_maxlength;
+    $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : 128);
     $roas["roas"][$k]["ta"] = $_ta;
 
     $k++;
@@ -187,7 +187,7 @@ foreach ($raw_array as $sub_array)
 
     $roas["roas"][$k]["asn"] = $_asn[0];
     $roas["roas"][$k]["prefix"] = $_prefix;
-    $roas["roas"][$k]["maxLength"] = $_maxlength;
+    $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : 32);
     $roas["roas"][$k]["ta"] = $_ta;
 
     $k++;