diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/push/GCMSender.java b/service/src/main/java/org/whispersystems/textsecuregcm/push/GCMSender.java
index c409f77ec..e82e983f3 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/push/GCMSender.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/push/GCMSender.java
@@ -41,6 +41,7 @@ public class GCMSender implements Managed {
   private final Map<String, Meter> outboundMeters = new HashMap<>() {{
     put("receipt", metricRegistry.meter(name(getClass(), "outbound", "receipt")));
     put("notification", metricRegistry.meter(name(getClass(), "outbound", "notification")));
+    put("challenge", metricRegistry.meter(name(getClass(), "outbound", "challenge")));
   }};
 
   private final AccountsManager   accountsManager;