diff --git a/coz b/coz
index f7654cc..b195eca 100755
--- a/coz
+++ b/coz
@@ -106,9 +106,6 @@ def _coz_run(args):
   if args.fixed_speedup != None:
     env['COZ_FIXED_SPEEDUP'] = str(args.fixed_speedup)
 
-  if args.debug_libraries:
-    env['LD_DEBUG'] = 'libs'
-
   try:
     result = subprocess.call(args.remaining_args, env=env)
   except KeyboardInterrupt:
@@ -188,10 +185,6 @@ _run_parser.add_argument('--fixed-speedup',
                          type=int, choices=list(range(0, 101)), default=None,
                          help='Evaluate optimizations of a specific amount')
 
-_run_parser.add_argument('--debug-libraries',
-                         action='store_true', default=False,
-                         help='Debug shared libraries (LD_DEBUG=libs)')
-
 # Use defaults to recover handler function and parser object from parser output
 _run_parser.set_defaults(func=_coz_run, parser=_run_parser)