diff --git a/src/InputOutput/WSImpl/Params/DownloadImpl/WSInputOutputParamsDownloadClass.php b/src/InputOutput/WSImpl/Params/DownloadImpl/WSInputOutputParamsDownloadClass.php
index e59a49f..9b4d6f2 100644
--- a/src/InputOutput/WSImpl/Params/DownloadImpl/WSInputOutputParamsDownloadClass.php
+++ b/src/InputOutput/WSImpl/Params/DownloadImpl/WSInputOutputParamsDownloadClass.php
@@ -63,7 +63,11 @@ class WSInputOutputParamsDownloadClass extends IHMInputOutputParamsAbstractClass
 			case "CDF" :
 				$downloadNode->setFileFormat(RequestOutputDownloadFileFormatEnum::CDF);
 				$formatExtension = ".cdf";
-				break;	
+				break;
+			case "CDF_ISTP" :
+				$downloadNode->setFileFormat(RequestOutputDownloadFileFormatEnum::CDF_ISTP);
+				$formatExtension = ".cdf";
+				break;
 			case "ASCII" :
 				$downloadNode->setFileFormat(RequestOutputDownloadFileFormatEnum::ASCII);
 				$formatExtension = ".txt";
diff --git a/src/Request/ParamsRequestImpl/Nodes/Requests/RequestOutputDownloadNodeClass.php b/src/Request/ParamsRequestImpl/Nodes/Requests/RequestOutputDownloadNodeClass.php
index ac7580f..c7af9d3 100644
--- a/src/Request/ParamsRequestImpl/Nodes/Requests/RequestOutputDownloadNodeClass.php
+++ b/src/Request/ParamsRequestImpl/Nodes/Requests/RequestOutputDownloadNodeClass.php
@@ -28,11 +28,12 @@ abstract class RequestOutputDownloadTimeFormatEnum
 
 abstract class RequestOutputDownloadFileFormatEnum
 {
-	const UNKNOWN = "";
-	const ASCII   = "ASCII";
-	const VOTABLE = "VOT";
-	const CDF     = "CDF";
-	const JSON    = "JSON";
+	const UNKNOWN  = "";
+	const ASCII    = "ASCII";
+	const VOTABLE  = "VOT";
+	const CDF      = "CDF";
+	const CDF_ISTP = "CDF_ISTP";
+	const JSON     = "JSON";
 }
 
 abstract class RequestOutputDownloadStructureEnum
--
libgit2 0.21.2