diff --git a/global_helpers/panther_azuresignin_helpers.py b/global_helpers/panther_azuresignin_helpers.py
index 3058f63fc..049623c6a 100644
--- a/global_helpers/panther_azuresignin_helpers.py
+++ b/global_helpers/panther_azuresignin_helpers.py
@@ -1,9 +1,14 @@
+from panther_base_helpers import deep_get
+
+
 def actor_user(event):
+    # 'event' could be a PantherEvent or an ImmutableCaseInsensitiveDict, so we have to use the
+    #   imported deep_get method.
     category = event.get("category", "")
     if category in {"ServicePrincipalSignInLogs"}:
-        return event.deep_get("properties", "servicePrincipalName")
+        return deep_get(event, "properties", "servicePrincipalName")
     if category in {"SignInLogs", "NonInteractiveUserSignInLogs"}:
-        return event.deep_get("properties", "userPrincipalName")
+        return deep_get(event, "properties", "userPrincipalName")
     return None