diff --git a/apex/apex.go b/apex/apex.go
index 9e7f3a0..bb4b62e 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -1211,6 +1211,13 @@
 			optFlags = append(optFlags, "--assets_dir "+filepath.Dir(noticeFile.String()))
 		}
 
+		if !ctx.Config().UnbundledBuild() && a.installable() {
+			// Apexes which are supposed to be installed in builtin dirs(/system, etc)
+			// don't need hashtree for activation. Therefore, by removing hashtree from
+			// apex bundle (filesystem image in it, to be specific), we can save storage.
+			optFlags = append(optFlags, "--no_hashtree")
+		}
+
 		ctx.Build(pctx, android.BuildParams{
 			Rule:        apexRule,
 			Implicits:   implicitInputs,