diff --git a/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts b/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts
index 53aab6d7a27ac..88994468dc270 100644
--- a/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts
+++ b/src/vs/workbench/parts/debug/electron-browser/debugViewer.ts
@@ -143,7 +143,7 @@ function renderRenameBox(debugService: debug.IDebugService, contextViewService:
 	inputBox.select();
 
 	let disposed = false;
-	const toDispose: [lifecycle.IDisposable] = [inputBox, styler];
+	const toDispose: lifecycle.IDisposable[] = [inputBox, styler];
 
 	const wrapUp = once((renamed: boolean) => {
 		if (!disposed) {