diff --git a/core/java/android/companion/CompanionDeviceManager.java b/core/java/android/companion/CompanionDeviceManager.java
index af5c6dd8e977d..2e672251cf680 100644
--- a/core/java/android/companion/CompanionDeviceManager.java
+++ b/core/java/android/companion/CompanionDeviceManager.java
@@ -1331,10 +1331,12 @@ public final class CompanionDeviceManager {
 
     /**
      * Enable or disable secure transport for testing. Defaults to enabled.
+     * Should not be used outside of testing.
      *
      * @param enabled true to enable. false to disable.
      * @hide
      */
+    @RequiresPermission(android.Manifest.permission.MANAGE_COMPANION_DEVICES)
     public void enableSecureTransport(boolean enabled) {
         try {
             mService.enableSecureTransport(enabled);