diff --git a/authfs/aidl/Android.bp b/authfs/aidl/Android.bp
index 35a3c4a..9504037 100644
--- a/authfs/aidl/Android.bp
+++ b/authfs/aidl/Android.bp
@@ -9,7 +9,10 @@
     backend: {
         rust: {
             enabled: true,
-            apex_available: ["com.android.virt"],
+            apex_available: [
+                "com.android.compos",
+                "com.android.virt",
+            ],
         },
     },
 }
diff --git a/authfs/aidl/com/android/virt/fs/IAuthFs.aidl b/authfs/aidl/com/android/virt/fs/IAuthFs.aidl
index 464a9a0..064b6f3 100644
--- a/authfs/aidl/com/android/virt/fs/IAuthFs.aidl
+++ b/authfs/aidl/com/android/virt/fs/IAuthFs.aidl
@@ -21,5 +21,5 @@
 /** @hide */
 interface IAuthFs {
     /** Returns a file descriptor given the name of a remote file descriptor. */
-    ParcelFileDescriptor openFile(long remoteFdName, boolean writable);
+    ParcelFileDescriptor openFile(int remoteFdName, boolean writable);
 }
diff --git a/authfs/service/src/authfs.rs b/authfs/service/src/authfs.rs
index 3b4febb..7a466d3 100644
--- a/authfs/service/src/authfs.rs
+++ b/authfs/service/src/authfs.rs
@@ -54,7 +54,7 @@
 impl IAuthFs for AuthFs {
     fn openFile(
         &self,
-        remote_fd_name: i64,
+        remote_fd_name: i32,
         writable: bool,
     ) -> binder::Result<ParcelFileDescriptor> {
         let mut path = PathBuf::from(&self.mountpoint);