diff --git a/.changeset/sour-news-sip.md b/.changeset/sour-news-sip.md
new file mode 100644
index 0000000000..b79c7ffec3
--- /dev/null
+++ b/.changeset/sour-news-sip.md
@@ -0,0 +1,5 @@
+---
+"@openproject/primer-view-components": patch
+---
+
+[68697] Allow deselecting tree view items in single select, when clicking on the selected item
diff --git a/app/components/primer/alpha/tree_view/tree_view.ts b/app/components/primer/alpha/tree_view/tree_view.ts
index 9de69abb2c..b2072e3064 100644
--- a/app/components/primer/alpha/tree_view/tree_view.ts
+++ b/app/components/primer/alpha/tree_view/tree_view.ts
@@ -206,10 +206,9 @@ export class TreeViewElement extends HTMLElement {
 
     if (!checkSuccess) return
 
-    const currentlyChecked = !this.getNodeCheckedValue(node)
-
-    // disallow unchecking checked item in single-select mode
-    if (!currentlyChecked) {
+    if (this.getNodeCheckedValue(node) === 'true') {
+      this.setNodeCheckedValue(node, 'false')
+    } else {
       this.checkOnlyAtPath(path)
     }