diff --git a/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactory.java b/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactory.java
index 3ed13c0963..295e1605be 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactory.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/offline/DefaultDownloaderFactory.java
@@ -103,7 +103,7 @@ public class DefaultDownloaderFactory implements DownloaderFactory {
       return constructor.newInstance(mediaItem, cacheDataSourceFactory, executor);
     } catch (Exception e) {
       throw new IllegalStateException(
-          "Failed to instantiate downloader for content type " + contentType);
+          "Failed to instantiate downloader for content type " + contentType, e);
     }
   }