diff --git a/src/deflate/zopfli_oxipng.rs b/src/deflate/zopfli_oxipng.rs
index 28960edf..d2b7602d 100644
--- a/src/deflate/zopfli_oxipng.rs
+++ b/src/deflate/zopfli_oxipng.rs
@@ -5,7 +5,7 @@ pub fn deflate(data: &[u8], options: zopfli::Options) -> PngResult<Vec<u8>> {
     // Since Rust v1.74, passing &[u8] directly into zopfli causes a regression in compressed size
     // for some files. Wrapping the slice in another Read implementer such as Box fixes it for now.
     match zopfli::compress(options, zopfli::Format::Zlib, Box::new(data), &mut output) {
-        Ok(_) => (),
+        Ok(()) => (),
         Err(_) => return Err(PngError::new("Failed to compress in zopfli")),
     }
     output.shrink_to_fit();
diff --git a/src/png/mod.rs b/src/png/mod.rs
index 913c2ab9..81552edf 100644
--- a/src/png/mod.rs
+++ b/src/png/mod.rs
@@ -348,7 +348,7 @@ impl PngImage {
                 last_pass = line.pass;
             }
             last_line.resize(line.data.len(), 0);
-            let filter = RowFilter::try_from(line.filter).map_err(|_| PngError::InvalidData)?;
+            let filter = RowFilter::try_from(line.filter).map_err(|()| PngError::InvalidData)?;
             filter.unfilter_line(bpp, line.data, &last_line, &mut unfiltered_buf);
             unfiltered.extend_from_slice(&unfiltered_buf);
             std::mem::swap(&mut last_line, &mut unfiltered_buf);