diff --git a/0001-urlgrabber-ext-down-another-python-3-compat.patch b/0001-urlgrabber-ext-down-another-python-3-compat.patch
new file mode 100644
index 0000000..c3d3470
--- /dev/null
+++ b/0001-urlgrabber-ext-down-another-python-3-compat.patch
@@ -0,0 +1,48 @@
+From e7a01334f653661c657d4c4e6e1ad10aababfb5b Mon Sep 17 00:00:00 2001
+From: Pavel Raiskup <praiskup@redhat.com>
+Date: Sun, 12 May 2019 08:54:01 +0200
+Subject: [PATCH] urlgrabber-ext-down: another python 3 compat
+
+Expect that _readlines() returns array of bytes objects in
+Python 3 environments.
+
+Fixes rhbz #1707657 and #1688173
+---
+ scripts/urlgrabber-ext-down | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/scripts/urlgrabber-ext-down b/scripts/urlgrabber-ext-down
+index bbaebd5..13d6dc7 100755
+--- a/scripts/urlgrabber-ext-down
++++ b/scripts/urlgrabber-ext-down
+@@ -19,12 +19,17 @@
+ #      Boston, MA  02111-1307  USA
+ 
+ import time, os, errno, sys
++import six
+ from urlgrabber.grabber import \
+     _readlines, URLGrabberOptions, _loads, \
+     PyCurlFileObject, URLGrabError
+ 
+ def write(fmt, *arg):
+-    try: os.write(1, fmt % arg)
++    buf = fmt % arg
++    if six.PY3:
++        buf = buf.encode()
++    try:
++        os.write(1, buf)
+     except OSError as e:
+         if e.args[0] != errno.EPIPE: raise
+         sys.exit(1)
+@@ -46,6 +51,8 @@ def main():
+         lines = _readlines(0)
+         if not lines: break
+         for line in lines:
++            if not isinstance(line, six.string_types):
++                line = line.decode('utf-8')
+             cnt += 1
+             opts = URLGrabberOptions()
+             opts._id = cnt
+-- 
+2.21.0
+
diff --git a/python-urlgrabber.spec b/python-urlgrabber.spec
index 0e9e2c5..00a2191 100644
--- a/python-urlgrabber.spec
+++ b/python-urlgrabber.spec
@@ -11,7 +11,7 @@
 
 Name:           python-%{pypi_name}
 Version:        %{majorver}.%{minorver}.%{patchver}
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        A high-level cross-protocol url-grabber
 
 License:        LGPLv2+
@@ -21,6 +21,8 @@ URL:            http://urlgrabber.baseurl.org/
 #Source0:        http://urlgrabber.baseurl.org/download/urlgrabber-%{version}.tar.gz
 Source0:        https://github.com/rpm-software-management/urlgrabber/releases/download/urlgrabber-%{dashversion}/urlgrabber-%{version}.tar.gz
 
+Patch0: 0001-urlgrabber-ext-down-another-python-3-compat.patch
+
 BuildArch:      noarch
 
 %global _description\
@@ -97,6 +99,9 @@ export URLGRABBER_EXT_DOWN="%{_builddir}/%{pypi_name}-%{version}/scripts/urlgrab
 %{python3_sitelib}/%{pypi_name}-%{version}-py?.?.egg-info
 
 %changelog
+* Sun May 12 2019 Pavel Raiskup <praiskup@redhat.com> - 4.0.0-2
+- python3 compat work-around to fix mock (rhbz#1707657, rhbz#1688173)
+
 * Mon Feb 25 2019 Neal Gompa <ngompa13@gmail.com> - 4.0.0-1
 - Update to 4.0.0
 - Add Python 3 subpackage and have binaries as Python 3