diff --git a/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts b/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts
index 4d490e96274ce9ad3e23cd34b3de5c0c2f936b46..4b8eb6fe799a8f8069def09c42b09af60e1331ba 100644
--- a/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts
+++ b/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts
@@ -379,6 +379,7 @@ function asTreeElement(item: BaseTreeItem): ITreeElement<LoadedScriptsItem> {
 	return {
 		element: item,
 		collapsed: !(item instanceof SessionTreeItem),
+		collapsible: item.hasChildren(),
 		children: children.map(asTreeElement)
 	};
 }