diff --git a/python/uv/_build_backend.py b/python/uv/_build_backend.py
index 88bd54c91..127342d8e 100644
--- a/python/uv/_build_backend.py
+++ b/python/uv/_build_backend.py
@@ -16,15 +16,19 @@ don't require importing typing but then quote them so earlier Python version ign
 them while IDEs and type checker can see through the quotes.
 """
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from typing import Any  # noqa:I001
 
-def warn_config_settings(config_settings: "dict | None" = None):
+
+def warn_config_settings(config_settings: "dict[Any, Any] | None" = None) -> None:
     import sys
 
     if config_settings:
         print("Warning: Config settings are not supported", file=sys.stderr)
 
 
-def call(args: "list[str]", config_settings: "dict | None" = None) -> str:
+def call(args: "list[str]", config_settings: "dict[Any, Any] | None" = None) -> str:
     """Invoke a uv subprocess and return the filename from stdout."""
     import shutil
     import subprocess
@@ -49,7 +53,9 @@ def call(args: "list[str]", config_settings: "dict | None" = None) -> str:
     return stdout[-1].strip()
 
 
-def build_sdist(sdist_directory: str, config_settings: "dict | None" = None):
+def build_sdist(
+    sdist_directory: str, config_settings: "dict[Any, Any] | None" = None
+) -> str:
     """PEP 517 hook `build_sdist`."""
     args = ["build-backend", "build-sdist", sdist_directory]
     return call(args, config_settings)
@@ -57,9 +63,9 @@ def build_sdist(sdist_directory: str, config_settings: "dict | None" = None):
 
 def build_wheel(
     wheel_directory: str,
-    config_settings: "dict | None" = None,
+    config_settings: "dict[Any, Any] | None" = None,
     metadata_directory: "str | None" = None,
-):
+) -> str:
     """PEP 517 hook `build_wheel`."""
     args = ["build-backend", "build-wheel", wheel_directory]
     if metadata_directory:
@@ -67,21 +73,25 @@ def build_wheel(
     return call(args, config_settings)
 
 
-def get_requires_for_build_sdist(config_settings: "dict | None" = None):
+def get_requires_for_build_sdist(
+    config_settings: "dict[Any, Any] | None" = None,
+) -> "list[str]":
     """PEP 517 hook `get_requires_for_build_sdist`."""
     warn_config_settings(config_settings)
     return []
 
 
-def get_requires_for_build_wheel(config_settings: "dict | None" = None):
+def get_requires_for_build_wheel(
+    config_settings: "dict[Any, Any] | None" = None,
+) -> "list[str]":
     """PEP 517 hook `get_requires_for_build_wheel`."""
     warn_config_settings(config_settings)
     return []
 
 
 def prepare_metadata_for_build_wheel(
-    metadata_directory: str, config_settings: "dict | None" = None
-):
+    metadata_directory: str, config_settings: "dict[Any, Any] | None" = None
+) -> str:
     """PEP 517 hook `prepare_metadata_for_build_wheel`."""
     args = ["build-backend", "prepare-metadata-for-build-wheel", metadata_directory]
     return call(args, config_settings)
@@ -89,9 +99,9 @@ def prepare_metadata_for_build_wheel(
 
 def build_editable(
     wheel_directory: str,
-    config_settings: "dict | None" = None,
+    config_settings: "dict[Any, Any] | None" = None,
     metadata_directory: "str | None" = None,
-):
+) -> str:
     """PEP 660 hook `build_editable`."""
     args = ["build-backend", "build-editable", wheel_directory]
     if metadata_directory:
@@ -99,15 +109,17 @@ def build_editable(
     return call(args, config_settings)
 
 
-def get_requires_for_build_editable(config_settings: "dict | None" = None):
+def get_requires_for_build_editable(
+    config_settings: "dict[Any, Any] | None" = None,
+) -> "list[str]":
     """PEP 660 hook `get_requires_for_build_editable`."""
     warn_config_settings(config_settings)
     return []
 
 
 def prepare_metadata_for_build_editable(
-    metadata_directory: str, config_settings: "dict | None" = None
-):
+    metadata_directory: str, config_settings: "dict[Any, Any] | None" = None
+) -> str:
     """PEP 660 hook `prepare_metadata_for_build_editable`."""
     args = ["build-backend", "prepare-metadata-for-build-editable", metadata_directory]
     return call(args, config_settings)