diff --git a/src/org/kar/archidata/externalRestApi/typescript/TsApiGeneration.java b/src/org/kar/archidata/externalRestApi/typescript/TsApiGeneration.java
index a8d2bd3..c9d18b4 100644
--- a/src/org/kar/archidata/externalRestApi/typescript/TsApiGeneration.java
+++ b/src/org/kar/archidata/externalRestApi/typescript/TsApiGeneration.java
@@ -268,7 +268,7 @@ public class TsApiGeneration {
 				data.append(",");
 			}
 			if (needGenerateProgress) {
-				data.append("\n\t\tcallback?: RESTCallbacks,");
+				data.append("\n\t\tcallbacks?: RESTCallbacks,");
 				toolImports.add("RESTCallbacks");
 			}
 			data.append("\n\t}): Promise<");
diff --git a/src/resources/rest-tools.ts b/src/resources/rest-tools.ts
index 77ea38a..041f350 100644
--- a/src/resources/rest-tools.ts
+++ b/src/resources/rest-tools.ts
@@ -74,7 +74,7 @@ export interface RESTRequestType {
   data?: any;
   params?: object;
   queries?: object;
-  callback?: RESTCallbacks;
+  callbacks?: RESTCallbacks;
 }
 
 function replaceAll(input, searchValue, replaceValue) {