diff --git a/src/Adapter/MockServerQuery.php b/src/Adapter/MockServerQuery.php
index 3a4e71dc..92b8fc5b 100644
--- a/src/Adapter/MockServerQuery.php
+++ b/src/Adapter/MockServerQuery.php
@@ -26,7 +26,7 @@ protected function syn(): void
 
         $rdy = $this->getTransport()->readLine();
 
-        if (!$rdy->startsWith(TeamSpeak3::TS3_PROTO_IDENT) && !$rdy->startsWith(TeamSpeak3::TEA_PROTO_IDENT) && !(defined("CUSTOM_PROTO_IDENT") && $rdy->startsWith(CUSTOM_PROTO_IDENT))) {
+        if (!$rdy->startsWith(TeamSpeak3::TS3_PROTO_IDENT) && !$rdy->startsWith(TeamSpeak3::TEA_PROTO_IDENT) && !$rdy->startsWith(TeamSpeak3::GREENTEA_PROTO_IDENT) && !(defined("CUSTOM_PROTO_IDENT") && $rdy->startsWith(CUSTOM_PROTO_IDENT))) {
             throw new AdapterException("invalid reply from the server (" . $rdy . ")");
         }
 
diff --git a/src/Adapter/ServerQuery.php b/src/Adapter/ServerQuery.php
index e0ecde2c..d0243439 100644
--- a/src/Adapter/ServerQuery.php
+++ b/src/Adapter/ServerQuery.php
@@ -64,7 +64,7 @@ protected function syn(): void
 
         $rdy = $this->getTransport()->readLine();
 
-        if (!$rdy->startsWith(TeamSpeak3::TS3_PROTO_IDENT) && !$rdy->startsWith(TeamSpeak3::TEA_PROTO_IDENT) && !(defined("CUSTOM_PROTO_IDENT") && $rdy->startsWith(CUSTOM_PROTO_IDENT))) {
+        if (!$rdy->startsWith(TeamSpeak3::TS3_PROTO_IDENT) && !$rdy->startsWith(TeamSpeak3::TEA_PROTO_IDENT) && !$rdy->startsWith(TeamSpeak3::GREENTEA_PROTO_IDENT) && !(defined("CUSTOM_PROTO_IDENT") && $rdy->startsWith(CUSTOM_PROTO_IDENT))) {
             throw new AdapterException("invalid reply from the server (" . $rdy . ")");
         }
 
diff --git a/src/Adapter/ServerQuery/Reply.php b/src/Adapter/ServerQuery/Reply.php
index 68872f80..0209d99f 100644
--- a/src/Adapter/ServerQuery/Reply.php
+++ b/src/Adapter/ServerQuery/Reply.php
@@ -300,7 +300,7 @@ protected function fetchError(StringHelper $err): void
     protected function fetchReply(array $rpl): void
     {
         foreach ($rpl as $key => $val) {
-            if ($val->startsWith(TeamSpeak3::TS3_MOTD_PREFIX) || $val->startsWith(TeamSpeak3::TEA_MOTD_PREFIX) || (defined("CUSTOM_MOTD_PREFIX") && $val->startsWith(CUSTOM_MOTD_PREFIX))) {
+            if ($val->startsWith(TeamSpeak3::TS3_MOTD_PREFIX) || $val->startsWith(TeamSpeak3::TEA_MOTD_PREFIX) || $val->startsWith(TeamSpeak3::GREENTEA_MOTD_PREFIX) || (defined("CUSTOM_MOTD_PREFIX") && $val->startsWith(CUSTOM_MOTD_PREFIX))) {
                 unset($rpl[$key]);
             } elseif ($val->startsWith(TeamSpeak3::EVENT)) {
                 $this->evt[] = new Event($val, $this->con);
diff --git a/src/TeamSpeak3.php b/src/TeamSpeak3.php
index d54a49c2..e00705d4 100644
--- a/src/TeamSpeak3.php
+++ b/src/TeamSpeak3.php
@@ -69,6 +69,16 @@ class TeamSpeak3
      */
     public const TEA_MOTD_PREFIX = "Welcome";
 
+    /**
+     * GreenTeaSpeak protocol welcome message.
+     */
+    public const GREENTEA_PROTO_IDENT = "GreenTeaSpeak";
+
+    /**
+     * GreenTeaSpeak protocol greeting message prefix.
+     */
+    public const GREENTEA_MOTD_PREFIX = "Welcome";
+
     /**
      * TeamSpeak 3 protocol error message prefix.
      */