diff --git a/libsignal-service/src/main/java/org/whispersystems/signalservice/internal/push/PushServiceSocket.java b/libsignal-service/src/main/java/org/whispersystems/signalservice/internal/push/PushServiceSocket.java
index 1883ad16e0..2f7b0a9a2a 100644
--- a/libsignal-service/src/main/java/org/whispersystems/signalservice/internal/push/PushServiceSocket.java
+++ b/libsignal-service/src/main/java/org/whispersystems/signalservice/internal/push/PushServiceSocket.java
@@ -267,7 +267,7 @@ public class PushServiceSocket {
   private static final String STICKER_MANIFEST_PATH          = "stickers/%s/manifest.proto";
   private static final String STICKER_PATH                   = "stickers/%s/full/%d";
 
-  private static final String GROUPSV2_CREDENTIAL       = "/v1/certificate/auth/group?redemptionStartSeconds=%d&redemptionEndSeconds=%d&pniAsServiceId=true";
+  private static final String GROUPSV2_CREDENTIAL       = "/v1/certificate/auth/group?redemptionStartSeconds=%d&redemptionEndSeconds=%d&zkcCredential=true";
   private static final String GROUPSV2_GROUP            = "/v1/groups/";
   private static final String GROUPSV2_GROUP_PASSWORD   = "/v1/groups/?inviteLinkPassword=%s";
   private static final String GROUPSV2_GROUP_CHANGES    = "/v1/groups/logs/%s?maxSupportedChangeEpoch=%d&includeFirstState=%s&includeLastState=false";