diff --git a/tasks.py b/tasks.py
index 77cb11a3..db7143a5 100644
--- a/tasks.py
+++ b/tasks.py
@@ -4,14 +4,14 @@ from invoke import run, task
 
 
 @task
-def docs(watch=False, warn=False):
+def docs(ctx, watch=False, warn=False):
     if watch:
         return watcher(docs)
     run('make -C docs/ html', warn=warn)
 
 
 @task
-def test(path=None, coverage=False, watch=False, warn=False):
+def test(ctx, path=None, coverage=False, watch=False, warn=False):
     if watch:
         return watcher(test, path=path, coverage=coverage)
     path = path or 'tests/'
@@ -23,14 +23,14 @@ def test(path=None, coverage=False, watch=False, warn=False):
 
 
 @task
-def lint(watch=False, warn=False):
+def lint(ctx, watch=False, warn=False):
     if watch:
         return watcher(lint)
     run('flake8', warn=warn)
 
 
 @task
-def update_authors():
+def update_authors(ctx):
     # Keep authors in the order of appearance and use awk to filter out dupes
     run("git log --format='- %aN <%aE>' --reverse | awk '!x[$0]++' > AUTHORS")