diff --git a/java/droiddoc.go b/java/droiddoc.go
index e39a556..85a61dd 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -1298,6 +1298,7 @@
 
 	cmd.BuiltTool(ctx, "metalava").
 		Flag(config.JavacVmFlags).
+		Flag("-J--add-opens=java.base/java.util=ALL-UNNAMED").
 		FlagWithArg("-encoding ", "UTF-8").
 		FlagWithArg("-source ", javaVersion.String()).
 		FlagWithRspFileInputList("@", srcs).