diff --git a/embassy-stm32/src/i2c/v1.rs b/embassy-stm32/src/i2c/v1.rs
index 28026f83c..a93a5d987 100644
--- a/embassy-stm32/src/i2c/v1.rs
+++ b/embassy-stm32/src/i2c/v1.rs
@@ -11,6 +11,7 @@ use embassy_embedded_hal::SetConfig;
 use embassy_futures::select::{select, Either};
 use embassy_hal_internal::drop::OnDrop;
 use embedded_hal_1::i2c::Operation;
+use mode::Master;
 
 use super::*;
 use crate::mode::Mode as PeriMode;
@@ -41,7 +42,7 @@ pub unsafe fn on_interrupt<T: Instance>() {
     });
 }
 
-impl<'d, M: PeriMode> I2c<'d, M> {
+impl<'d, M: PeriMode> I2c<'d, M, Master> {
     pub(crate) fn init(&mut self, freq: Hertz, _config: Config) {
         self.info.regs.cr1().modify(|reg| {
             reg.set_pe(false);
@@ -354,7 +355,7 @@ impl<'d, M: PeriMode> I2c<'d, M> {
     }
 }
 
-impl<'d> I2c<'d, Async> {
+impl<'d> I2c<'d, Async, Master> {
     async fn write_frame(&mut self, address: u8, write: &[u8], frame: FrameOptions) -> Result<(), Error> {
         self.info.regs.cr2().modify(|w| {
             // Note: Do not enable the ITBUFEN bit in the I2C_CR2 register if DMA is used for
@@ -800,7 +801,7 @@ impl Timings {
     }
 }
 
-impl<'d, M: PeriMode> SetConfig for I2c<'d, M> {
+impl<'d, M: PeriMode> SetConfig for I2c<'d, M, Master> {
     type Config = Hertz;
     type ConfigError = ();
     fn set_config(&mut self, config: &Self::Config) -> Result<(), ()> {