diff --git a/alexi/segment.py b/alexi/segment.py
index 3eb0e8a..50069de 100644
--- a/alexi/segment.py
+++ b/alexi/segment.py
@@ -277,8 +277,10 @@ def literal(_, word):
 
 def page2features(page, feature_func: Union[str, FeatureFunc] = literal, n: int = 1):
     if isinstance(feature_func, str):
-        feature_func = FEATURES.get(feature_func, literal)
-    features = [feature_func(i, w) for i, w in enumerate(page)]
+        feature_func_func = FEATURES.get(feature_func, literal)
+    else:
+        feature_func_func = feature_func
+    features = [feature_func_func(i, w) for i, w in enumerate(page)]
 
     def adjacent(features, label):
         return (":".join((label, feature)) for feature in features if feature != "bias")
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 5896202..72b01d1 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,17 +6,4 @@ pytest
 coverage
 pytest-cov
 types-beautifulsoup4
-types-colorama
-types-decorator
-types-docutils
-types-html5lib
-types-Pillow
-types-psutil
-types-Pygments
-types-python-dateutil
-types-pytz
 types-requests
-types-setuptools
-types-tabulate
-types-tqdm
-types-urllib3