diff --git a/python/dolma/taggers/code/code_taggers.py b/python/dolma/taggers/code/code_taggers.py
index 31b57087..43779a9b 100644
--- a/python/dolma/taggers/code/code_taggers.py
+++ b/python/dolma/taggers/code/code_taggers.py
@@ -138,7 +138,7 @@ def _score(self, text: str, copyright_spans: List[Span]) -> float:
             else:
                 span = copyright_spans[0]
                 # percentage of content affected
-                score = (span.end - span.start + 1) * 1.0 / len(text)
+                score = (span.end - span.start) * 1.0 / len(text)
         except ZeroDivisionError:
             score = -1.0
         return score