diff --git a/compos/composd/src/instance_starter.rs b/compos/composd/src/instance_starter.rs
index 8189fe0..91a0e61 100644
--- a/compos/composd/src/instance_starter.rs
+++ b/compos/composd/src/instance_starter.rs
@@ -26,7 +26,7 @@
 use compos_aidl_interface::binder::{ParcelFileDescriptor, Strong};
 use compos_common::compos_client::{VmInstance, VmParameters};
 use compos_common::{
-    COMPOS_DATA_ROOT, INSTANCE_IMAGE_FILE, PRIVATE_KEY_BLOB_FILE, PUBLIC_KEY_FILE,
+    COMPOS_DATA_ROOT, IDSIG_FILE, INSTANCE_IMAGE_FILE, PRIVATE_KEY_BLOB_FILE, PUBLIC_KEY_FILE,
 };
 use log::{info, warn};
 use std::env;
@@ -51,6 +51,7 @@
     instance_name: String,
     instance_root: PathBuf,
     instance_image: PathBuf,
+    idsig: PathBuf,
     key_blob: PathBuf,
     public_key: PathBuf,
     vm_parameters: VmParameters,
@@ -59,14 +60,16 @@
 impl InstanceStarter {
     pub fn new(instance_name: &str, vm_parameters: VmParameters) -> Self {
         let instance_root = Path::new(COMPOS_DATA_ROOT).join(instance_name);
-        let instant_root_path = instance_root.as_path();
-        let instance_image = instant_root_path.join(INSTANCE_IMAGE_FILE);
-        let key_blob = instant_root_path.join(PRIVATE_KEY_BLOB_FILE);
-        let public_key = instant_root_path.join(PUBLIC_KEY_FILE);
+        let instance_root_path = instance_root.as_path();
+        let instance_image = instance_root_path.join(INSTANCE_IMAGE_FILE);
+        let idsig = instance_root_path.join(IDSIG_FILE);
+        let key_blob = instance_root_path.join(PRIVATE_KEY_BLOB_FILE);
+        let public_key = instance_root_path.join(PUBLIC_KEY_FILE);
         Self {
             instance_name: instance_name.to_owned(),
             instance_root,
             instance_image,
+            idsig,
             key_blob,
             public_key,
             vm_parameters,
@@ -124,6 +127,8 @@
         let _ = fs::create_dir(&self.instance_root);
 
         self.create_instance_image(virtualization_service)?;
+        // Delete existing idsig file. Ignore error in case idsig doesn't exist.
+        let _ = fs::remove_file(&self.idsig);
 
         let compos_instance = self.start_vm(virtualization_service)?;
         let service = &compos_instance.service;
@@ -170,9 +175,13 @@
             .write(true)
             .open(&self.instance_image)
             .context("Failed to open instance image")?;
-        let vm_instance =
-            VmInstance::start(virtualization_service, instance_image, &self.vm_parameters)
-                .context("Starting VM")?;
+        let vm_instance = VmInstance::start(
+            virtualization_service,
+            instance_image,
+            &self.idsig,
+            &self.vm_parameters,
+        )
+        .context("Starting VM")?;
         let service = vm_instance.get_service().context("Connecting to CompOS")?;
         Ok(CompOsInstance { vm_instance, service, lazy_service_guard: Default::default() })
     }