diff --git a/embassy-stm32/src/gpio.rs b/embassy-stm32/src/gpio.rs
index 92239853c3..6967ecc7c9 100644
--- a/embassy-stm32/src/gpio.rs
+++ b/embassy-stm32/src/gpio.rs
@@ -539,8 +539,8 @@ impl OutputType {
     #[cfg(gpio_v1)]
     const fn to_cnf_out(self) -> vals::CnfOut {
         match self {
-            OutputType::PushPull => vals::CnfOut::ALTPUSH_PULL,
-            OutputType::OpenDrain => vals::CnfOut::ALTOPEN_DRAIN,
+            OutputType::PushPull => vals::CnfOut::ALT_PUSH_PULL,
+            OutputType::OpenDrain => vals::CnfOut::ALT_OPEN_DRAIN,
         }
     }