diff --git a/src/calibre/__init__.py b/src/calibre/__init__.py
index 0424b44682..f9698a23ac 100644
--- a/src/calibre/__init__.py
+++ b/src/calibre/__init__.py
@@ -216,7 +216,7 @@ def prints(*args, **kwargs):
             file.write(sep)
             count += len(sep)
     file.write(end)
-    count += len(sep)
+    count += len(end)
     return count