diff --git a/procrastinate/sql/__init__.py b/procrastinate/sql/__init__.py
index 73c002540..10539224d 100644
--- a/procrastinate/sql/__init__.py
+++ b/procrastinate/sql/__init__.py
@@ -1,6 +1,8 @@
 import re
 import sys
-from typing import Dict
+from typing import Dict, cast
+
+from typing_extensions import LiteralString
 
 # https://github.com/pypa/twine/pull/551
 if sys.version_info[:2] < (3, 9):  # coverage: exclude
@@ -11,7 +13,7 @@
 QUERIES_REGEX = re.compile(r"(?:\n|^)-- ([a-z0-9_]+) --\n(?:-- .+\n)*", re.MULTILINE)
 
 
-def parse_query_file(query_file: str) -> Dict["str", "str"]:
+def parse_query_file(query_file: str) -> Dict["str", LiteralString]:
     split = iter(QUERIES_REGEX.split(query_file))
     next(split)  # Consume the header of the file
     result = {}
@@ -19,13 +21,16 @@ def parse_query_file(query_file: str) -> Dict["str", "str"]:
         while True:
             key = next(split)
             value = next(split).strip()
-            result[key] = value
+            # procrastinate takes full responsibility for the queries, we
+            # can safely vouch for them being as safe as if they were
+            # defined in the code itself.
+            result[key] = cast(LiteralString, value)
     except StopIteration:
         pass
     return result
 
 
-def get_queries() -> Dict["str", "str"]:
+def get_queries() -> Dict["str", LiteralString]:
     return parse_query_file(
         (importlib_resources.files("procrastinate.sql") / "queries.sql").read_text(
             encoding="utf-8"