diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index e905151..9c72c5e 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -25,8 +25,8 @@ jobs:
       run: |
         pip install flake8
         # stop the build if there are Python syntax errors or undefined names
-        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        flake8 wostools tests --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --statistics
+        flake8 wostools tests --count --exit-zero --statistics
     - name: Test with pytest
       run: python setup.py test
diff --git a/.zenodo.json b/.zenodo.json
index 24fc819..8f0b7cd 100644
--- a/.zenodo.json
+++ b/.zenodo.json
@@ -2,7 +2,7 @@
     "description": "Translates isi web of knowledge files into python objects.",
     "license": "MIT",
     "title": "coreofscience/python-wostools",
-    "version": "v2.0.0",
+    "version": "v2.0.1",
     "upload_type": "software",
     "publication_date": "2018-08-13",
     "creators": [
@@ -25,7 +25,7 @@
     "related_identifiers": [
         {
             "scheme": "url",
-            "identifier": "https://github.com/coreofscience/python-wostools/tree/v2.0.0",
+            "identifier": "https://github.com/coreofscience/python-wostools/tree/v2.0.1",
             "relation": "isSupplementTo"
         },
         {
diff --git a/HISTORY.md b/HISTORY.md
index c389fd6..73d20dd 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,11 @@
 # History
 
-## 2.0.0 (2020-08-09)
+## 2.0.1 (2020-08-09)
+
+-   Fix error with wos files that have an invisible character before the field
+    key.
+
+## 2.0.0 (2020-08-08)
 
 -   Make the article class more concrete
 -   Make collections iterable
diff --git a/setup.cfg b/setup.cfg
index aefb114..6b1a61f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -11,5 +11,3 @@ select = B,C,E,F,W,T4,B9
 [aliases]
 test = pytest
 
-[tool:pytest]
-collect_ignore = ['setup.py']
diff --git a/setup.py b/setup.py
index 9d07288..16c8ed3 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
     test_suite="tests",
     tests_require=test_requirements,
     url="https://github.com/coreofscience/python-wostools",
-    version="2.0.0",
+    version="2.0.1",
     zip_safe=False,
     long_description_content_type="text/markdown",
 )
diff --git a/tests/test_collection_cached.py b/tests/test_collection_cached.py
index 0ef0530..fe9a04f 100644
--- a/tests/test_collection_cached.py
+++ b/tests/test_collection_cached.py
@@ -1,5 +1,5 @@
 import io
-from typing import Collection, List, Dict, Tuple
+from typing import List, Dict, Tuple
 
 from pytest import fixture
 from pytest_bdd import scenarios, given, when, then
diff --git a/wostools/__init__.py b/wostools/__init__.py
index 5885702..5844bd0 100644
--- a/wostools/__init__.py
+++ b/wostools/__init__.py
@@ -2,7 +2,7 @@
 
 __author__ = """Core of Science"""
 __email__ = "dev@coreofscience.com"
-__version__ = "2.0.0"
+__version__ = "2.0.1"
 
 from wostools.article import Article
 from wostools.lazy import LazyCollection
diff --git a/wostools/_testutils.py b/wostools/_testutils.py
index 0e4dc9b..2c55b6b 100644
--- a/wostools/_testutils.py
+++ b/wostools/_testutils.py
@@ -35,7 +35,7 @@ def assert_data(self, name=None) -> Iterator[T]:
 
     @contextmanager
     def assert_error(self) -> Iterator[Exception]:
-        assert self.error, f"Expected an error and found none"
+        assert self.error, "Expected an error and found none"
         yield self.error
 
     @contextmanager
diff --git a/wostools/article.py b/wostools/article.py
index e66c11f..43dbb56 100644
--- a/wostools/article.py
+++ b/wostools/article.py
@@ -9,7 +9,9 @@
 logger = logging.getLogger(__name__)
 
 # The null part accounts for an ISI wok bug
-ISI_LINE_PATTERN = re.compile(r"^(null)?((?P<field>[A-Z0-9]{2})|  )( (?P<value>.*))?$")
+ISI_LINE_PATTERN = re.compile(
+    r"^(null|.)?((?P<field>[A-Z0-9]{2})|  )( (?P<value>.*))?$"
+)
 
 ISI_CITATION_PATTERN = re.compile(
     r"""^(?P<AU>[^,]+)?,[ ]         # First author