diff --git a/firebase_admin/_auth_utils.py b/firebase_admin/_auth_utils.py
index e368342e8..02d32b659 100644
--- a/firebase_admin/_auth_utils.py
+++ b/firebase_admin/_auth_utils.py
@@ -43,30 +43,32 @@ class PageIterator:
     def __init__(self, current_page):
         if not current_page:
             raise ValueError('Current page must not be None.')
+
         self._current_page = current_page
-        self._index = 0
+        self._iter = None
+
+    def __next__(self):
+        if self._iter is None:
+            self._iter = iter(self.items)
 
-    def next(self):
-        if self._index == len(self.items):
+        try:
+            return next(self._iter)
+        except StopIteration:
             if self._current_page.has_next_page:
                 self._current_page = self._current_page.get_next_page()
-                self._index = 0
-        if self._index < len(self.items):
-            result = self.items[self._index]
-            self._index += 1
-            return result
-        raise StopIteration
+                self._iter = iter(self.items)
 
-    @property
-    def items(self):
-        raise NotImplementedError
+                return next(self._iter)
 
-    def __next__(self):
-        return self.next()
+            raise
 
     def __iter__(self):
         return self
 
+    @property
+    def items(self):
+        raise NotImplementedError
+
 
 def get_emulator_host():
     emulator_host = os.getenv(EMULATOR_HOST_ENV_VAR, '')