Remove apply()
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 9cb03bc..6827244 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -995,7 +995,7 @@
                         os.chdir(cwd)
 
                     if preexec_fn:
-                        apply(preexec_fn)
+                        preexec_fn()
 
                     if env is None:
                         os.execvp(executable, args)