diff --git a/app/src/main/java/info/nightscout/android/medtronic/MedtronicCnlReader.java b/app/src/main/java/info/nightscout/android/medtronic/MedtronicCnlReader.java
index 261e956cc6bd54a8f219e3b2e954f7ec167f3a5c..a7a8d215d4e1db1be3af9fcae1d746bec356d340 100644
--- a/app/src/main/java/info/nightscout/android/medtronic/MedtronicCnlReader.java
+++ b/app/src/main/java/info/nightscout/android/medtronic/MedtronicCnlReader.java
@@ -122,7 +122,8 @@ public class MedtronicCnlReader {
 
         this.getPumpSession().setLinkMAC(linkMAC);
         this.getPumpSession().setPumpMAC(pumpMAC);
-        Log.d(TAG, String.format("Finished requestReadInfo. linkMAC = '%d', pumpMAC = '%d", linkMAC, pumpMAC));
+        Log.d(TAG, String.format("Finished requestReadInfo. linkMAC = '%s', pumpMAC = '%s'",
+                Long.toHexString(linkMAC), Long.toHexString(pumpMAC)));
     }
 
     public void requestLinkKey() throws IOException, TimeoutException, EncryptionException, ChecksumException, UnexpectedMessageException {