diff --git a/bigtools/src/utils/cli/bigwigtobedgraph.rs b/bigtools/src/utils/cli/bigwigtobedgraph.rs
index 883020d..743153f 100644
--- a/bigtools/src/utils/cli/bigwigtobedgraph.rs
+++ b/bigtools/src/utils/cli/bigwigtobedgraph.rs
@@ -156,7 +156,7 @@ pub async fn write_bg<R: Reopen + SeekableRead + Send + 'static>(
     let end = chrom.as_ref().and_then(|_| end);
 
     let chroms: Vec<ChromInfo> = bigwig.chroms().to_vec();
-    let chrom_files: Vec<io::Result<(_, TempFileBuffer<File>, String)>> = chroms
+    let chrom_files: Vec<io::Result<(_, TempFileBuffer<File>)>> = chroms
         .into_iter()
         .filter(|c| chrom.as_ref().map_or(true, |chrom| &c.name == chrom))
         .map(|chrom| {
@@ -191,16 +191,15 @@ pub async fn write_bg<R: Reopen + SeekableRead + Send + 'static>(
             }
             let start = start.unwrap_or(0);
             let end = end.unwrap_or(chrom.length);
-            let name = chrom.name.clone();
             let handle = runtime
                 .spawn(file_future(bigwig, chrom, writer, start, end))
                 .map(|f| f.unwrap());
-            Ok((handle, buf, name))
+            Ok((handle, buf))
         })
         .collect::<Vec<_>>();
 
     for res in chrom_files {
-        let (f, mut buf, name) = res?;
+        let (f, mut buf) = res?;
         buf.switch(out_file);
         f.await?;
         while !buf.is_real_file_ready() {
diff --git a/bigtools/tests/bigwigwrite.rs b/bigtools/tests/bigwigwrite.rs
index 5bb5acc..c69f02d 100644
--- a/bigtools/tests/bigwigwrite.rs
+++ b/bigtools/tests/bigwigwrite.rs
@@ -9,7 +9,7 @@ use tempfile;
 use bigtools::bed::bedparser::BedParser;
 use bigtools::bedchromdata::BedParserStreamingIterator;
 use bigtools::utils::chromvalues::ChromValues;
-use bigtools::{BigWigRead, BigWigWrite};
+use bigtools::{BigWigRead, BigWigWrite, Value};
 use tokio::runtime;
 
 #[test]
@@ -159,3 +159,40 @@ fn test_multi_chrom() -> io::Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn test_iter() {
+    let chroms = vec![
+        "chrY", "chrY", "chrY", "chrY", "chrY", "chrY", "chrY", "chrY", "chrY", "chrY",
+    ];
+    let starts: Vec<u32> = vec![530, 538, 584, 713, 751, 860, 865, 873, 879, 902];
+    let ends: Vec<u32> = vec![538, 584, 713, 751, 860, 865, 873, 879, 902, 923];
+
+    let iter = chroms
+        .into_iter()
+        .zip(starts.into_iter().zip(ends.into_iter()));
+    let iter = iter.map(|(chrom, (start, end))| {
+        Ok::<(String, Value), std::io::Error>((
+            chrom.to_string(),
+            Value {
+                start,
+                end,
+                value: 0.0,
+            },
+        ))
+    });
+
+    let vals_iter = BedParserStreamingIterator::new(BedParser::wrap_iter(iter), true);
+
+    let chrom_map = HashMap::from([
+        ("chrY".to_string(), 57_227_415)
+    ]);
+
+    let runtime = tokio::runtime::Builder::new_current_thread()
+        .build()
+        .expect("Unable to create runtime.");
+
+    let tempfile = tempfile::NamedTempFile::new().unwrap();
+    let outb = BigWigWrite::create_file(tempfile.path().to_string_lossy().to_string());
+    outb.write_singlethreaded(chrom_map, vals_iter, runtime).unwrap();
+}
\ No newline at end of file