diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d50cd6ad..adfe5974 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -16,6 +16,7 @@ version 1.0.0-dev
   checksum.
 + All the decompression NO_HDR flags on igzip_lib were
   incorrectly documented. This is now fixed.
++ Fixed building source failed when environment variable "D" was set.
 
 version 0.11.1
 ------------------
diff --git a/setup.py b/setup.py
index 84f90beb..90e33c7a 100644
--- a/setup.py
+++ b/setup.py
@@ -26,6 +26,8 @@
 import tempfile
 from pathlib import Path
 
+os.environ.pop('D', None)
+
 from setuptools import Extension, find_packages, setup
 from setuptools.command.build_ext import build_ext