diff --git a/SourceQuery/SourceQuery.php b/SourceQuery/SourceQuery.php
index 7100366..a29d7f3 100644
--- a/SourceQuery/SourceQuery.php
+++ b/SourceQuery/SourceQuery.php
@@ -200,7 +200,15 @@
 				throw new SocketException( 'Not connected.', SocketException::NOT_CONNECTED );
 			}
 			
-			$this->Socket->Write( self::A2S_INFO, "Source Engine Query\0" );
+			if( $this->Challenge )
+			{
+				$this->Socket->Write( self::A2S_INFO, "Source Engine Query\0" . $this->Challenge );
+			}
+			else
+			{
+				$this->Socket->Write( self::A2S_INFO, "Source Engine Query\0" );
+			}
+
 			$Buffer = $this->Socket->Read( );
 			$Type = $Buffer->GetByte( );
 			$Server = [];