diff --git a/src/globus_sdk/scopes/_graph_parser.py b/src/globus_sdk/scopes/_graph_parser.py
index 1718e0b73..0b7cf032e 100644
--- a/src/globus_sdk/scopes/_graph_parser.py
+++ b/src/globus_sdk/scopes/_graph_parser.py
@@ -237,8 +237,10 @@ def _peek_enumerate(data: str | list[str]) -> t.Iterator[tuple[int, str, str | N
     if not data:
         return
 
-    prev: str = data[0]
-    for idx, c in enumerate(data[1:]):
+    iterator = enumerate(data, start=-1)
+    prev: str
+    _, prev = next(iterator)
+    for idx, c in iterator:
         yield (idx, prev, c)
         prev = c
 
diff --git a/tests/benchmark/test_scope_parser.py b/tests/benchmark/test_scope_parser.py
index fdcc18f63..c3cd62053 100644
--- a/tests/benchmark/test_scope_parser.py
+++ b/tests/benchmark/test_scope_parser.py
@@ -1,6 +1,6 @@
 import pytest
 
-from globus_sdk.scopes import ScopeParser
+from globus_sdk.scopes import ScopeParser, TransferScopes
 
 
 def _make_deep_scope(depth):
@@ -20,6 +20,11 @@ def _make_wide_scope(width):
     return big_scope
 
 
+def test_ordinary_scope_parsing(benchmark):
+    scope_string = f"openid profile {TransferScopes.all}"
+    benchmark(ScopeParser.parse, scope_string)
+
+
 @pytest.mark.parametrize("depth", (10, 100, 1000, 2000, 3000, 4000, 5000))
 def test_deep_scope_parsing(benchmark, depth):
     scope_string = _make_deep_scope(depth)