diff --git a/src/main.rs b/src/main.rs
index 8bd372b..8132af7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -27,10 +27,10 @@ fn main() -> ! {
         .pclk1(Hertz::MHz(32))
         .freeze(&mut flash.acr, &mut pwr);
 
-    let mut gpioa = dp.GPIOA.split(&mut rcc.ahb2);
-    let mut led_pin = gpioa
-        .pa0
-        .into_push_pull_output(&mut gpioa.moder, &mut gpioa.otyper);
+    let mut gpiob = dp.GPIOB.split(&mut rcc.ahb2);
+    let mut led_pin = gpiob
+        .pb12
+        .into_push_pull_output(&mut gpiob.moder, &mut gpiob.otyper);
 
     let mut timer = Delay::new(cp.SYST, clocks);