diff --git a/src/lib.rs b/src/lib.rs
index 6f86cc4..a9ca418 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -128,12 +128,17 @@ pub fn fetch(params: FetchParams, builder: impl DictionaryBuilder) -> Result<(),
         // copy(&source_path, &source_path_for_build)?;
         let tmp_path = Path::new(&build_dir).join(params.file_name.to_owned() + ".download");
 
+        if let Some(path) = params.download_url.strip_prefix("file://") {
+            std::fs::copy(path, &tmp_path)?;
+        }
+        else {
         // Download a tarball
         let resp = ureq::get(params.download_url).call()?;
         let mut dest = File::create(&tmp_path)?;
 
         io::copy(&mut resp.into_reader(), &mut dest)?;
         dest.flush()?;
+        }
 
         rename(tmp_path, source_path_for_build).expect("Failed to rename temporary file");
 
@@ -153,7 +158,6 @@ pub fn fetch(params: FetchParams, builder: impl DictionaryBuilder) -> Result<(),
         archive.unpack(&tmp_extract_path)?;
         rename(tmp_extracted_path, &input_dir).expect("Failed to rename archive directory");
         let _ = std::fs::remove_dir_all(&tmp_extract_path);
-        drop(dest);
         let _ = std::fs::remove_file(source_path_for_build);
     }