diff --git a/java/src/main/java/org/whispersystems/libsignal/groups/SenderKeyName.java b/java/src/main/java/org/whispersystems/libsignal/groups/SenderKeyName.java
index f9b6a01d..ffefe146 100644
--- a/java/src/main/java/org/whispersystems/libsignal/groups/SenderKeyName.java
+++ b/java/src/main/java/org/whispersystems/libsignal/groups/SenderKeyName.java
@@ -49,4 +49,8 @@ public int hashCode() {
     return this.groupId.hashCode() ^ this.sender.hashCode();
   }
 
+  @Override
+  public String toString() {
+    return groupId + ":" + sender.getName() + ":" + sender.getDeviceId();
+  }
 }