diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 19e92b7..2a142ba 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -298,6 +298,7 @@
 		FlagForEachArg("--dex-location=", image.dexLocations).
 		Flag("--generate-debug-info").
 		Flag("--generate-build-id").
+		Flag("--image-format=lz4hc").
 		FlagWithOutput("--oat-symbols=", symbolsFile).
 		Flag("--strip").
 		FlagWithOutput("--oat-file=", outputPath.ReplaceExtension(ctx, "oat")).