diff --git a/Attrap_pref75.py b/Attrap_pref75.py
index 709f89daf4cf22dbaa87b7a9ed5ad15a088f61e3..306a680c1e2e0d4e97584fda2380a926b154842f 100644
--- a/Attrap_pref75.py
+++ b/Attrap_pref75.py
@@ -60,7 +60,7 @@ class Attrap_pref75(Attrap):
                 False
             )[::-1]
             for month_page in month_pages:
-                month_date = Attrap.guess_date(f'{month_page['name']} {year}', "(.*)").replace(day=1)
+                month_date = Attrap.guess_date(f"{month_page['name']} {year}", "(.*)").replace(day=1)
                 if month_date >= self.not_before.replace(day=1):
                     pages_to_parse.append(month_page['url'])