diff --git a/payload_generator/generate_delta_main.cc b/payload_generator/generate_delta_main.cc
index 170a612..d32221d 100644
--- a/payload_generator/generate_delta_main.cc
+++ b/payload_generator/generate_delta_main.cc
@@ -217,12 +217,6 @@
 }
 
 int Main(int argc, char** argv) {
-  DEFINE_string(old_dir, "",
-                "[DEPRECATED] Directory where the old rootfs is loop mounted "
-                "read-only. Not required anymore.");
-  DEFINE_string(new_dir, "",
-                "[DEPRECATED] Directory where the new rootfs is loop mounted "
-                "read-only. Not required anymore.");
   DEFINE_string(old_image, "", "Path to the old rootfs");
   DEFINE_string(new_image, "", "Path to the new rootfs");
   DEFINE_string(old_kernel, "", "Path to the old kernel partition image");
@@ -312,14 +306,6 @@
 
   logging::InitLogging(log_settings);
 
-  // Check flags.
-  if (!FLAGS_old_dir.empty()) {
-    LOG(INFO) << "--old_dir flag is deprecated and ignored.";
-  }
-  if (!FLAGS_new_dir.empty()) {
-    LOG(INFO) << "--new_dir flag is deprecated and ignored.";
-  }
-
   vector<int> signature_sizes;
   ParseSignatureSizes(FLAGS_signature_size, &signature_sizes);