diff --git a/psycopg/psycopg/pq/_pq_ctypes.py b/psycopg/psycopg/pq/_pq_ctypes.py
index bf04d560..9e79fc3f 100644
--- a/psycopg/psycopg/pq/_pq_ctypes.py
+++ b/psycopg/psycopg/pq/_pq_ctypes.py
@@ -13,16 +13,7 @@ from typing import List, Optional, Tuple
 
 from ..errors import NotSupportedError
 
-if sys.platform == "win32":
-    libname = ctypes.util.find_library("libpq.dll")
-elif sys.platform == "darwin":
-    libname = ctypes.util.find_library("libpq.dylib")
-else:
-    libname = ctypes.util.find_library("pq")
-if not libname:
-    raise ImportError("libpq library not found")
-
-pq = ctypes.cdll.LoadLibrary(libname)
+pq = ctypes.cdll.LoadLibrary("@libpq@")
 
 # Get the libpq version to define what functions are available.