diff --git a/setup.py b/setup.py
index 3716a7b9f..f05379d6d 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,6 @@ import subprocess
 import sys
 import warnings
 from collections.abc import Iterator
-from typing import Any
 
 from setuptools import Extension, setup
 from setuptools.command.build_ext import build_ext
@@ -148,7 +147,7 @@ class RequiredDependencyException(Exception):
 PLATFORM_MINGW = os.name == "nt" and "GCC" in sys.version
 
 
-def _dbg(s: str, tp: Any = None) -> None:
+def _dbg(s: str, tp: str | tuple[str, ...] | None = None) -> None:
     if DEBUG:
         if tp:
             print(s % tp)
@@ -509,11 +508,11 @@ class pil_build_ext(build_ext):
 
             if root is None and pkg_config:
                 if isinstance(lib_name, str):
-                    _dbg(f"Looking for `{lib_name}` using pkg-config.")
+                    _dbg("Looking for `%s` using pkg-config.", lib_name)
                     root = pkg_config(lib_name)
                 else:
                     for lib_name2 in lib_name:
-                        _dbg(f"Looking for `{lib_name2}` using pkg-config.")
+                        _dbg("Looking for `%s` using pkg-config.", lib_name2)
                         root = pkg_config(lib_name2)
                         if root:
                             break
@@ -732,7 +731,7 @@ class pil_build_ext(build_ext):
                             best_path = os.path.join(directory, name)
                             _dbg(
                                 "Best openjpeg version %s so far in %s",
-                                (best_version, best_path),
+                                (str(best_version), best_path),
                             )
 
             if best_version and _find_library_file(self, "openjp2"):