diff --git a/.travis.yml b/.travis.yml
index 26107204..06f9567f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,7 @@ python:
   - "3.5"
   - "3.6"
   - "3.7"
+  - "3.8-dev"
 
 install: pip install tox tox-travis
 
diff --git a/pytest_bdd/steps.py b/pytest_bdd/steps.py
index e423d24b..071de4bc 100644
--- a/pytest_bdd/steps.py
+++ b/pytest_bdd/steps.py
@@ -220,6 +220,8 @@ def set_code(func, code):
     ]
     if six.PY3:
         argnames.insert(1, "co_kwonlyargcount")
+        if sys.version_info.minor >= 8:
+            argnames.insert(1, "co_posonlyargcount")
 
     for arg in get_args(func):
         if arg in add_args:
diff --git a/tox.ini b/tox.ini
index 8365eda8..b8a0e85d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ distshare = {homedir}/.tox/distshare
 envlist = py27-pytestlatest-linters,
           py27-pytest{36,37,38,39,310,4,41,42,43,44,45,46},
           py37-pytest{36,37,38,39,310,4,41,42,43,44,45,46,5,latest},
-          py{35,36}-pytestlatest,
+          py{35,36,38}-pytestlatest,
           py27-pytestlatest-xdist
 skip_missing_interpreters = true