diff --git a/payload_consumer/install_plan.cc b/payload_consumer/install_plan.cc
index 39827a4..06b7dd8 100644
--- a/payload_consumer/install_plan.cc
+++ b/payload_consumer/install_plan.cc
@@ -122,6 +122,7 @@
                              partition.target_hash.size())},
             {"run_postinstall", utils::ToString(partition.run_postinstall)},
             {"postinstall_path", partition.postinstall_path},
+            {"readonly_target_path", partition.readonly_target_path},
             {"filesystem_type", partition.filesystem_type},
         },
         "\n  "));
@@ -165,7 +166,7 @@
           partition.name, target_slot, source_slot);
       TEST_AND_RETURN_FALSE(device.has_value());
       partition.target_path = device->rw_device_path;
-      partition.postinstall_mount_device = device->mountable_device_path;
+      partition.readonly_target_path = device->readonly_device_path;
     } else {
       partition.target_path.clear();
     }
diff --git a/payload_consumer/install_plan.h b/payload_consumer/install_plan.h
index 43b94fc..7c77789 100644
--- a/payload_consumer/install_plan.h
+++ b/payload_consumer/install_plan.h
@@ -109,7 +109,7 @@
     std::string target_path;
     // |mountable_target_device| is intended to be a path to block device which
     // can be used for mounting this block device's underlying filesystem.
-    std::string postinstall_mount_device;
+    std::string readonly_target_path;
     uint64_t target_size{0};
     brillo::Blob target_hash;
 
diff --git a/payload_consumer/install_plan_unittest.cc b/payload_consumer/install_plan_unittest.cc
index 2ca8d81..7779494 100644
--- a/payload_consumer/install_plan_unittest.cc
+++ b/payload_consumer/install_plan_unittest.cc
@@ -38,6 +38,7 @@
           .source_path = "foo-source-path",
           .source_hash = {0xb1, 0xb2},
           .target_path = "foo-target-path",
+          .readonly_target_path = "mountable-device",
           .target_hash = {0xb3, 0xb4},
           .postinstall_path = "foo-path",
           .filesystem_type = "foo-type",
@@ -66,6 +67,7 @@
   target_hash: B3B4
   run_postinstall: false
   postinstall_path: foo-path
+  readonly_target_path: mountable-device
   filesystem_type: foo-type
 Payload: 0
   urls: (url1,url2)
diff --git a/payload_consumer/postinstall_runner_action.cc b/payload_consumer/postinstall_runner_action.cc
index de7848b..051ccbf 100644
--- a/payload_consumer/postinstall_runner_action.cc
+++ b/payload_consumer/postinstall_runner_action.cc
@@ -140,7 +140,7 @@
   const InstallPlan::Partition& partition =
       install_plan_.partitions[current_partition_];
 
-  const string mountable_device = partition.postinstall_mount_device;
+  const string mountable_device = partition.readonly_target_path;
   if (mountable_device.empty()) {
     LOG(ERROR) << "Cannot make mountable device from " << partition.target_path;
     return CompletePostinstall(ErrorCode::kPostinstallRunnerError);
diff --git a/payload_consumer/postinstall_runner_action_unittest.cc b/payload_consumer/postinstall_runner_action_unittest.cc
index 5ee2989..792ee28 100644
--- a/payload_consumer/postinstall_runner_action_unittest.cc
+++ b/payload_consumer/postinstall_runner_action_unittest.cc
@@ -195,7 +195,7 @@
   InstallPlan::Partition part;
   part.name = "part";
   part.target_path = device_path;
-  part.postinstall_mount_device = device_path;
+  part.readonly_target_path = device_path;
   part.run_postinstall = true;
   part.postinstall_path = postinstall_program;
   InstallPlan install_plan;
@@ -360,7 +360,7 @@
   InstallPlan::Partition part;
   part.name = "part";
   part.target_path = "/dev/null";
-  part.postinstall_mount_device = "/dev/null";
+  part.readonly_target_path = "/dev/null";
   part.run_postinstall = true;
   part.postinstall_path = kPostinstallDefaultScript;
   part.postinstall_optional = true;