diff --git a/src/hexdoc/utils/deserialize/toml.py b/src/hexdoc/utils/deserialize/toml.py
index 17f03051..e84de695 100644
--- a/src/hexdoc/utils/deserialize/toml.py
+++ b/src/hexdoc/utils/deserialize/toml.py
@@ -8,8 +8,6 @@
 
 # TODO: there's (figuratively) literally no comments in this file
 
-TOMLDict = dict[str, "TOMLValue"]
-
 TOMLValue = (
     str
     | int
@@ -19,10 +17,12 @@
     | datetime.date
     | datetime.time
     | list["TOMLValue"]
-    | TOMLDict
+    | dict[str, "TOMLValue"]
     | None
 )
 
+TOMLDict = dict[str, "TOMLValue"]
+
 
 def fill_placeholders(data: TOMLDict):
     _fill_placeholders(data, [data], set())