doc/news.rst | 1 +
 pyderasn.py  | 8 ++------

diff --git a/doc/news.rst b/doc/news.rst
index 2578fed9d6cda1098cc3aa8330b2784147cf070c08943830721c04a71a9ab2b3..2391094f11e5f92e98fc02e9fad86fa3435f8acefb3ea4979426d512d763b93e 100644
--- a/doc/news.rst
+++ b/doc/news.rst
@@ -6,6 +6,7 @@
 3.1
 ---
 * Fix bug related to DecodeError showing with DecodePathDefBy entities
+* Respect ``NO_COLOR`` environment variable
 
 .. _release3.0:
 
diff --git a/pyderasn.py b/pyderasn.py
index fe13f77ab8e166732a32be41c80511a80351fe67a2588b8d94c93095ba192c24..cb72899a5790c467ede77d19210289f4135f676930390414325d056150e27d40 100755
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -472,6 +472,7 @@ from collections import namedtuple
 from collections import OrderedDict
 from datetime import datetime
 from math import ceil
+from os import environ
 
 from six import add_metaclass
 from six import binary_type
@@ -4500,11 +4501,6 @@         "--defines-by-path",
         help="Python path to decoder's defines_by_path",
     )
     parser.add_argument(
-        "--with-colours",
-        action='store_true',
-        help="Enable coloured output",
-    )
-    parser.add_argument(
         "DERFile",
         type=argparse.FileType("rb"),
         help="Path to DER file you want to decode",
@@ -4530,7 +4526,7 @@     )
     print(pprinter(
         obj,
         oids=oids,
-        with_colours=True if args.with_colours else False,
+        with_colours=True if environ.get("NO_COLOR") is None else False,
     ))
     if tail != b"":
         print("\nTrailing data: %s" % hexenc(tail))