diff --git a/src/main.rs b/src/main.rs
index 4bc618a..52a0769 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -496,7 +496,9 @@ impl FormatPatch {
                             .ok_or(miette!("Interdiff patch path is not utf-8"))?
                             .to_string();
 
-                        match path.ends_with(COVER_LETTER_NAME) || path.ends_with(STACKED_ON_NAME) {
+                        match path.ends_with(&format!("{COVER_LETTER_NAME}.patch"))
+                            || path.ends_with(STACKED_ON_NAME)
+                        {
                             true => Ok(None),
                             false => Ok(Some(path)),
                         }