diff --git a/procmail2notmuch/src/main.rs b/procmail2notmuch/src/main.rs
index a6759b7..fd178e8 100644
--- a/procmail2notmuch/src/main.rs
+++ b/procmail2notmuch/src/main.rs
@@ -158,7 +158,7 @@ fn notmuch_from_rules<W: Write>(mut w: W, rules: &[Rule]) -> anyhow::Result<()>
                 lines.push(format!(
                     // TODO(wathiede): this assumes `notmuch new` is configured to add
                     // `tag:unprocessed` to all new mail.
-                    "-unprocessed +{} -- tag:unprocessed {}{}",
+                    r#"-unprocessed +{} -- tag:unprocessed {}"{}""#,
                     t,
                     match m.match_type {
                         MatchType::From => "from:",