diff --git a/src/pwm.rs b/src/pwm.rs
index adf9faa..f1870ab 100644
--- a/src/pwm.rs
+++ b/src/pwm.rs
@@ -222,7 +222,7 @@ impl Pwm {
     ///
     /// [`enable`]: #method.enable
     pub fn with_pwmchip(pwmchip: u8, index: u8) -> Result<Pwm> {
-        sysfs::export(pwmchip, index as u8)?;
+        sysfs::export(pwmchip, index)?;
 
         let pwm = Pwm {
             chip: pwmchip,
diff --git a/src/spi/segment.rs b/src/spi/segment.rs
index a584d23..9ad4b98 100644
--- a/src/spi/segment.rs
+++ b/src/spi/segment.rs
@@ -243,7 +243,7 @@ impl<'a, 'b> Segment<'a, 'b> {
     }
 }
 
-impl<'a, 'b> fmt::Debug for Segment<'a, 'b> {
+impl fmt::Debug for Segment<'_, '_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("Segment")
             .field("tx_buf", &self.tx_buf)