diff --git a/cli/src/subcommand.rs b/cli/src/subcommand.rs
index 99d4d80..823b15f 100644
--- a/cli/src/subcommand.rs
+++ b/cli/src/subcommand.rs
@@ -171,9 +171,9 @@ impl Callback for FormatContext {
             let mut extension = doc.filepath.extension().unwrap_or_default().to_os_string();
             extension.push(".formatted");
             let copied = doc.filepath.with_extension(extension);
-            doc.save(Some(&copied))
+            doc.save_to(copied)
         } else {
-            doc.save(None)
+            doc.save()
         }
     }
 }
@@ -234,9 +234,9 @@ impl RemoveContext {
             let mut extension = doc.filepath.extension().unwrap_or_default().to_os_string();
             extension.push(".removed");
             let copied = doc.filepath.with_extension(extension);
-            doc.save(Some(&copied))
+            doc.save_to(copied)
         } else {
-            doc.save(None)
+            doc.save()
         }
     }
 }
diff --git a/fmt/src/document/mod.rs b/fmt/src/document/mod.rs
index 93d0a79..de2d817 100644
--- a/fmt/src/document/mod.rs
+++ b/fmt/src/document/mod.rs
@@ -17,6 +17,7 @@ use std::collections::HashMap;
 use std::fs;
 use std::fs::File;
 use std::io::BufRead;
+use std::path::Path;
 use std::path::PathBuf;
 
 use exn::ErrorExt;
@@ -164,8 +165,14 @@ impl Document {
         }
     }
 
-    pub fn save(&mut self, filepath: Option<&PathBuf>) -> Result<(), Error> {
-        let filepath = filepath.unwrap_or(&self.filepath);
+    pub fn save(&mut self) -> Result<(), Error> {
+        let filepath = self.filepath.as_path();
+        fs::write(filepath, self.parser.file_content.content())
+            .or_raise(|| Error::new(format!("cannot save document {}", filepath.display())))
+    }
+
+    pub fn save_to(&mut self, filepath: impl AsRef<Path>) -> Result<(), Error> {
+        let filepath = filepath.as_ref();
         fs::write(filepath, self.parser.file_content.content())
             .or_raise(|| Error::new(format!("cannot save document {}", filepath.display())))
     }