diff --git a/src/display/src/main.rs b/src/display/src/main.rs
index 35a7eb5..ace61df 100644
--- a/src/display/src/main.rs
+++ b/src/display/src/main.rs
@@ -120,7 +120,7 @@ fn main() -> ! {
     writeln!(stdout, "Start").unwrap();
     if let Some(p) = microbit::Peripherals::take() {
         // Split GPIO
-        let mut gpio = p.GPIO.split();
+        let gpio = p.GPIO.split();
         
         // Configure RX and TX pins accordingly
         let tx = gpio.pin24.into_push_pull_output().downgrade();
diff --git a/src/microbit/examples/buttons.rs b/src/microbit/examples/buttons.rs
index fa34342..000ece1 100644
--- a/src/microbit/examples/buttons.rs
+++ b/src/microbit/examples/buttons.rs
@@ -16,7 +16,7 @@ use microbit::hal::serial::BAUD115200;
 fn main() -> ! {
     if let Some(p) = microbit::Peripherals::take() {
         // Split GPIO
-        let mut gpio = p.GPIO.split();
+        let gpio = p.GPIO.split();
         // Configure RX and TX pins accordingly
         let tx = gpio.pin24.into_push_pull_output().downgrade();
         let rx = gpio.pin25.into_floating_input().downgrade();