1 files changed, 1 insertions, 1 deletions

diff --git a/examples/stm32f3/src/bin/button.rs b/examples/stm32f3/src/bin/button.rs
index b55bf3901..2f47d8f80 100644
--- a/examples/stm32f3/src/bin/button.rs
+++ b/examples/stm32f3/src/bin/button.rs
@@ -13,7 +13,7 @@ fn main() -> ! {
 
     let p = embassy_stm32::init(Default::default());
 
-    let button = Input::new(p.PA0, Pull::Down);
+    let mut button = Input::new(p.PA0, Pull::Down);
     let mut led1 = Output::new(p.PE9, Level::High, Speed::Low);
     let mut led2 = Output::new(p.PE15, Level::High, Speed::Low);