diff --git a/filesystem/avb_add_hash_footer.go b/filesystem/avb_add_hash_footer.go
index ead579fc4..469f1fb0a 100644
--- a/filesystem/avb_add_hash_footer.go
+++ b/filesystem/avb_add_hash_footer.go
@@ -138,7 +138,7 @@ func (a *avbAddHashFooter) GenerateAndroidBuildActions(ctx android.ModuleContext
 		if rollbackIndex < 0 {
 			ctx.PropertyErrorf("rollback_index", "Rollback index must be non-negative")
 		}
-		cmd.Flag(fmt.Sprintf(" --rollback_index %x", rollbackIndex))
+		cmd.Flag(fmt.Sprintf(" --rollback_index %d", rollbackIndex))
 	}
 
 	cmd.FlagWithOutput("--image ", a.output)