diff --git a/core/java/android/companion/AssociationInfo.java b/core/java/android/companion/AssociationInfo.java
index f70e662971e7e..3f02aa28ae05c 100644
--- a/core/java/android/companion/AssociationInfo.java
+++ b/core/java/android/companion/AssociationInfo.java
@@ -118,7 +118,7 @@ public final class AssociationInfo implements Parcelable {
 
     /** @hide */
     public @Nullable String getDeviceMacAddressAsString() {
-        return mDeviceMacAddress != null ? mDeviceMacAddress.toString() : null;
+        return mDeviceMacAddress != null ? mDeviceMacAddress.toString().toUpperCase() : null;
     }
 
     /**