diff --git a/src/tinycss/tokenizer.py b/src/tinycss/tokenizer.py
index ec02ed22cf..154c111e20 100644
--- a/src/tinycss/tokenizer.py
+++ b/src/tinycss/tokenizer.py
@@ -212,4 +212,5 @@ try:
 except (ImportError, RuntimeError):
     c_tokenize_flat = None
 else:
-    c_tokenize_flat = lambda s, ignore_comments=False:tok.tokenize_flat(s, ignore_comments)
+    # Use the c tokenizer by default
+    c_tokenize_flat = tokenize_flat = lambda s, ignore_comments=False:tok.tokenize_flat(s, ignore_comments)