diff --git a/getdist/yaml_format_tools.py b/getdist/yaml_format_tools.py
index 4666863..d7addf0 100644
--- a/getdist/yaml_format_tools.py
+++ b/getdist/yaml_format_tools.py
@@ -28,6 +28,7 @@
 _minuslogpost = "minuslogpost"
 _post = "post"
 
+
 # Exceptions
 class InputSyntaxError(Exception):
     """Syntax error in YAML input."""
diff --git a/setup.py b/setup.py
index 2141970..dd3e156 100644
--- a/setup.py
+++ b/setup.py
@@ -33,6 +33,7 @@ def get_long_description():
       long_description=get_long_description(),
       author='Antony Lewis',
       url="https://github.com/cmbant/getdist",
+      zip_safe=False,
       packages=['getdist', 'getdist.gui', 'paramgrid', 'getdist_tests'],
       scripts=['GetDist.py', 'GetDistGUI.py'],
       test_suite='getdist_tests',