diff --git a/src/widgets/proxmoxbackupserver/widget.js b/src/widgets/proxmoxbackupserver/widget.js
index 46598fd11..c807c0cef 100644
--- a/src/widgets/proxmoxbackupserver/widget.js
+++ b/src/widgets/proxmoxbackupserver/widget.js
@@ -10,7 +10,8 @@ const widget = {
     },
     "nodes/localhost/tasks": {
       endpoint: "nodes/localhost/tasks",
-      params: ["errors", "limit", "since"],
+      params: ["errors", "limit"],
+      optionalParams: ["since"],
     },
     "nodes/localhost/status": {
       endpoint: "nodes/localhost/status",
diff --git a/src/widgets/proxmoxbackupserver/widget.test.js b/src/widgets/proxmoxbackupserver/widget.test.js
index 024cc0fd9..dd9278a39 100644
--- a/src/widgets/proxmoxbackupserver/widget.test.js
+++ b/src/widgets/proxmoxbackupserver/widget.test.js
@@ -9,7 +9,8 @@ describe("proxmoxbackupserver widget config", () => {
     expectWidgetConfigShape(widget);
   });
 
-  it("requires failed task query params for the tasks endpoint", () => {
-    expect(widget.mappings["nodes/localhost/tasks"].params).toEqual(["errors", "limit", "since"]);
+  it("requires failed task query params for the tasks endpoint, with since optional", () => {
+    expect(widget.mappings["nodes/localhost/tasks"].params).toEqual(["errors", "limit"]);
+    expect(widget.mappings["nodes/localhost/tasks"].optionalParams).toEqual(["since"]);
   });
 });