diff --git a/.gitignore b/.gitignore
index b2db1c3..bee93c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.jython_cache/
 
 # Created by https://www.toptal.com/developers/gitignore/api/python,linux,windows,macos,jetbrains,visualstudiocode
 # Edit at https://www.toptal.com/developers/gitignore?templates=python,linux,windows,macos,jetbrains,visualstudiocode
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index efd7f15..c57cffb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -15,6 +15,20 @@ py3.8-unit_tests:
     - nosetests tests/*.py
     - python setup.py sdist bdist_wheel
 
+jy2.7-unit_tests:
+  image: openjdk:11-slim
+  before_script:
+    - apt-get -y update
+    - apt-get -y install wget
+    - ./devel_scripts/install_jython.sh
+    - export PATH="$HOME/jython/bin:$PATH"
+    - jython -m pip install -r requirements.txt
+    - jython -m pip install -r requirements_dev.txt
+  script:
+    - jython -m nose tests/*.py
+    # wheel building doesn't work on jython
+    - jython setup.py sdist
+
 py2.7-integration_test:
   image: python:2.7-buster
   before_script:
@@ -41,3 +55,14 @@ py3.9-integration_test:
     - apt-get -y install network-manager
   script:
     - python3 -m librefi
+
+jy2.7-integration_tests:
+  image: openjdk:11-slim
+  before_script:
+    - apt-get -y update
+    - apt-get -y install wget network-manager
+    - ./devel_scripts/install_jython.sh
+    - export PATH="$HOME/jython/bin:$PATH"
+    - jython -m pip install -r requirements.txt
+  script:
+    - jython -m librefi
diff --git a/devel_scripts/install_jython.sh b/devel_scripts/install_jython.sh
new file mode 100755
index 0000000..2c86cf7
--- /dev/null
+++ b/devel_scripts/install_jython.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+# https://git.sakamoto.pl/laudom/haruhi-dl/-/blob/master/devscripts/install_jython.sh
+
+wget https://repo1.maven.org/maven2/org/python/jython-installer/2.7.2/jython-installer-2.7.2.jar
+if [ "$(sha512sum jython-installer-2.7.2.jar | awk '{print $1}')" != "d3ae09ebcb1ad27123d1b325729a18aa9e793039ca3428167455ce51217f10735949d2acea39f89e5414015c97bdd319657aced3753b764dddb09200e8cff40e" ]; then
+    echo "invalid sha512 checksum for jython installer"
+    exit 2137
+fi
+
+java -jar jython-installer-2.7.2.jar -s -d "$HOME/jython"
diff --git a/librefi/compat.py b/librefi/compat.py
index 15f9930..6a4fd38 100644
--- a/librefi/compat.py
+++ b/librefi/compat.py
@@ -2652,7 +2652,13 @@ except ImportError:  # Python 2
 
 compat_os_name = os._name if os.name == 'java' else os.name
 
-compat_sys_platform = sys.platform
+# jython returns something like PyShadowString('java1.8.0_272', 'linux2')
+# https://www.javadoc.io/static/org.python/jython-standalone/2.7.1/org/python/core/PyShadowString.html
+# we are only interested in the shadow string here
+try:
+    compat_sys_platform = sys.platform.getshadow()
+except AttributeError:
+    compat_sys_platform = sys.platform
 # a little breaking changes on python 3.3 and 3.8
 # https://docs.python.org/3/library/sys.html#sys.platform
 if compat_sys_platform.startswith('linux'):
diff --git a/requirements_dev.txt b/requirements_dev.txt
index f3c7e8e..451cb85 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1 +1,2 @@
 nose
+wheel
diff --git a/tests/py2_compat.py b/tests/compat.py
similarity index 78%
rename from tests/py2_compat.py
rename to tests/compat.py
index dd8f18a..e13b6e9 100644
--- a/tests/py2_compat.py
+++ b/tests/compat.py
@@ -4,6 +4,11 @@ from __future__ import unicode_literals
 from os import listdir, path
 import re
 
+from librefi.compat import (
+    compat_sys_platform,
+    compat_str,
+)
+
 
 def test_fxcker_files_py2_compatibility():
     dir = path.join('.', 'librefi', 'fxckers')
@@ -17,3 +22,8 @@ def test_fxcker_files_py2_compatibility():
                     print(content)
                     print(fxcker)
                     raise AssertionError('fxcker %s not containing required compat imports' % (fxcker))
+
+
+def test_compat_sys_platform():
+    assert isinstance(compat_sys_platform, compat_str)
+    assert 'java' not in compat_sys_platform