diff --git a/src/parse.py b/src/parse.py
index feef213..c54226f 100644
--- a/src/parse.py
+++ b/src/parse.py
@@ -35,7 +35,7 @@
 # Represents a stream of consumable tokens
 class TokenStream:
     def __init__(self, tokens):
-        self.tokens = tokens.copy()
+        self.tokens = tokens
 
     def __repr__(self):
         return "TokenStream(tokens %s)" % (self.tokens)  # pragma: no mutate
diff --git a/tests/test_parse.py b/tests/test_parse.py
index 3bebe34..61c043d 100644
--- a/tests/test_parse.py
+++ b/tests/test_parse.py
@@ -69,12 +69,11 @@
 
 # Tests a token stream reads tokens correctly
 # We expect the following behaviour:
-# - The input token list is copied
 # - All tokens are popped in order
 # - None tokens are returned at the end of the stream
 @given(lists(test_tokenize.draw_token_random()))
 def test_parse_token_stream(tokens):
-    stream = parse.TokenStream(tokens)
+    stream = parse.TokenStream(tokens.copy())
     read = []
     token = stream.pop()
     while token is not None: