diff --git a/crates/ruff/resources/test/fixtures/pyflakes/F841_2.py b/crates/ruff/resources/test/fixtures/pyflakes/F841_2.py
index 54ad9bda33..89bf98ac13 100644
--- a/crates/ruff/resources/test/fixtures/pyflakes/F841_2.py
+++ b/crates/ruff/resources/test/fixtures/pyflakes/F841_2.py
@@ -1,6 +1,15 @@
 from __future__ import annotations
 
-# test case for https://github.com/charliermarsh/ruff/issues/1552
-def _():
+
+# Test case for https://github.com/charliermarsh/ruff/issues/1552
+def f():
     x = 0
     list()[x:]
+
+
+# Test case for https://github.com/charliermarsh/ruff/issues/2603
+def f():
+    KeyTupleT = tuple[str, ...]
+
+    keys_checked: set[KeyTupleT] = set()
+    return keys_checked
diff --git a/crates/ruff/src/checkers/ast.rs b/crates/ruff/src/checkers/ast.rs
index 80281bfe36..16c5926dd6 100644
--- a/crates/ruff/src/checkers/ast.rs
+++ b/crates/ruff/src/checkers/ast.rs
@@ -5302,10 +5302,10 @@ pub fn check_ast(
     // Check any deferred statements.
     checker.check_deferred_functions();
     checker.check_deferred_lambdas();
-    checker.check_deferred_assignments();
     checker.check_deferred_type_definitions();
     let mut allocator = vec![];
     checker.check_deferred_string_type_definitions(&mut allocator);
+    checker.check_deferred_assignments();
     checker.check_deferred_for_loops();
 
     // Check docstrings.