diff --git a/optional/fetchmail/fetchmail.py b/optional/fetchmail/fetchmail.py
index 539610a6..51cf0c73 100755
--- a/optional/fetchmail/fetchmail.py
+++ b/optional/fetchmail/fetchmail.py
@@ -66,7 +66,7 @@ def run(debug):
         for fetch in fetches:
             fetchmailrc = ""
             options = "options antispam 501, 504, 550, 553, 554"
-            if "OPTIONS" in os.environ: options += f' {os.environ['OPTIONS']}'
+            if "OPTIONS" in os.environ: options += f' {os.environ["OPTIONS"]}'
             options += " ssl" if fetch["tls"] else ""
             options += " keep" if fetch["keep"] else " fetchall"
             folders = f"folders {",".join(f'"{imaputf7encode(item).replace('"',r"\34")}"' for item in fetch["folders"]) or '"INBOX"'}"