diff --git a/embassy-stm32/src/rcc/u5/mod.rs b/embassy-stm32/src/rcc/u5/mod.rs
index a713be499..dbf5e8dfb 100644
--- a/embassy-stm32/src/rcc/u5/mod.rs
+++ b/embassy-stm32/src/rcc/u5/mod.rs
@@ -12,4 +12,4 @@ impl Default for Config {
     }
 }
 
-pub unsafe fn init(config: Config) {}
+pub unsafe fn init(_config: Config) {}