diff --git a/mido/backends/portmidi_init.py b/mido/backends/portmidi_init.py
index 84bb128..5efcdaa 100644
--- a/mido/backends/portmidi_init.py
+++ b/mido/backends/portmidi_init.py
@@ -10,13 +10,7 @@ from ctypes import (CDLL, CFUNCTYPE, POINTER, Structure, c_char_p,
                     create_string_buffer, byref)
 import ctypes.util
 
-dll_name = ''
-if sys.platform == 'darwin':
-    dll_name = ctypes.util.find_library('libportmidi.dylib')
-elif sys.platform in ('win32', 'cygwin'):
-    dll_name = 'portmidi.dll'
-else:
-    dll_name = 'libportmidi.so'
+dll_name = '@libportmidi@'
 
 lib = CDLL(dll_name)