diff --git a/testutils/src/main/java/com/google/android/exoplayer2/testutil/TestDownloadManagerListener.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/TestDownloadManagerListener.java
index 56e6b7cacc..c3d62fc53b 100644
--- a/testutils/src/main/java/com/google/android/exoplayer2/testutil/TestDownloadManagerListener.java
+++ b/testutils/src/main/java/com/google/android/exoplayer2/testutil/TestDownloadManagerListener.java
@@ -67,10 +67,10 @@ public final class TestDownloadManagerListener implements DownloadManager.Listen
             () -> {
               if (downloadManager.isIdle()) {
                 idleCondition.open();
-                checkedOnMainThread.open();
               }
+              checkedOnMainThread.open();
             });
-    checkedOnMainThread.block(TIMEOUT_MS);
+    assertThat(checkedOnMainThread.block(TIMEOUT_MS)).isTrue();
     assertThat(idleCondition.block(TIMEOUT_MS)).isTrue();
   }