diff --git a/spacy/compat.py b/spacy/compat.py
index dc0883542..d5eee8431 100644
--- a/spacy/compat.py
+++ b/spacy/compat.py
@@ -88,11 +88,11 @@ def symlink_to(orig, dest):
 
 
 def is_config(python2=None, python3=None, windows=None, linux=None, osx=None):
-    return ((python2 is None or python2 == is_python2) and
-            (python3 is None or python3 == is_python3) and
-            (windows is None or windows == is_windows) and
-            (linux is None or linux == is_linux) and
-            (osx is None or osx == is_osx))
+    return (python2 in (None, is_python2) and
+            python3 in (None, is_python3) and
+            windows in (None, is_windows) and
+            linux in (None, is_linux) and
+            osx in (None, is_osx))
 
 
 def normalize_string_keys(old):