diff --git a/src/vs/base/common/history.ts b/src/vs/base/common/history.ts
index 6eba18a69c09c13a0d2b3d4b07f6c80b0e36f65e..22e921b8d77929993240906710f447e988a899d7 100644
--- a/src/vs/base/common/history.ts
+++ b/src/vs/base/common/history.ts
@@ -24,7 +24,7 @@ export class HistoryNavigator<T> implements INavigator<T> {
 	}
 
 	public addIfNotPresent(t: T) {
-		if(!this._history.contains(t)) {
+		if (!this._history.contains(t)) {
 			this.add(t);
 		}
 	}