diff --git a/apex/builder.go b/apex/builder.go
index 24c049b..148f42f 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -761,7 +761,7 @@
 	rule := java.Signapk
 	args := map[string]string{
 		"certificates": pem.String() + " " + key.String(),
-		"flags":        "-a 4096", //alignment
+		"flags":        "-a 4096 --align-file-size", //alignment
 	}
 	implicits := android.Paths{pem, key}
 	if ctx.Config().UseRBE() && ctx.Config().IsEnvTrue("RBE_SIGNAPK") {