diff --git a/embassy-stm32-examples/src/bin/usb_serial.rs b/embassy-stm32-examples/src/bin/usb_serial.rs
index 7e95f1221..6a1d27d54 100644
--- a/embassy-stm32-examples/src/bin/usb_serial.rs
+++ b/embassy-stm32-examples/src/bin/usb_serial.rs
@@ -17,11 +17,11 @@ use embassy::time::{Duration, Timer};
 use embassy::util::Forever;
 use embassy_extras::usb::usb_serial::UsbSerial;
 use embassy_extras::usb::Usb;
+use embassy_stm32::hal::otg_fs::{UsbBus, USB};
+use embassy_stm32::hal::prelude::*;
 use embassy_stm32::{interrupt, pac, rtc};
 use futures::future::{select, Either};
 use futures::pin_mut;
-use stm32f4xx_hal::otg_fs::{UsbBus, USB};
-use stm32f4xx_hal::prelude::*;
 use usb_device::bus::UsbBusAllocator;
 use usb_device::prelude::*;
 
diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
index 6ab434d1f..523359417 100644
--- a/embassy-stm32/Cargo.toml
+++ b/embassy-stm32/Cargo.toml
@@ -46,6 +46,6 @@ embedded-hal    = { version = "0.2.4" }
 embedded-dma    = { version = "0.1.2" }
 bxcan = "0.5.0"
 nb = "*"
-stm32f4xx-hal = { version = "0.9.0", features = ["rt", "can"], optional = true }
+stm32f4xx-hal = { version = "0.9.0", features = ["rt", "can", "usb_fs"], optional = true }
 stm32l0xx-hal = { version = "0.7.0", features = ["rt"], optional = true }
 futures = { version = "0.3.5", default-features = false, features = ["async-await"] }
\ No newline at end of file
diff --git a/embassy-stm32/src/rtc.rs b/embassy-stm32/src/rtc.rs
index 824a47072..b1abba325 100644
--- a/embassy-stm32/src/rtc.rs
+++ b/embassy-stm32/src/rtc.rs
@@ -1,8 +1,8 @@
+use crate::hal::bb;
+use crate::hal::rcc::Clocks;
 use core::cell::Cell;
 use core::convert::TryInto;
 use core::sync::atomic::{compiler_fence, AtomicU32, Ordering};
-use stm32f4xx_hal::bb;
-use stm32f4xx_hal::rcc::Clocks;
 
 use embassy::interrupt::InterruptExt;
 use embassy::time::{Clock, TICKS_PER_SECOND};
@@ -259,7 +259,7 @@ macro_rules! impl_timer {
     ($module:ident: ($TYPE:ident, $INT:ident, $apbenr:ident, $enrbit:expr, $apbrstr:ident, $rstrbit:expr, $ppre:ident, $pclk: ident), 3) => {
         mod $module {
             use super::*;
-            use stm32f4xx_hal::pac::{$TYPE, RCC};
+            use crate::hal::pac::{$TYPE, RCC};
 
             impl sealed::Sealed for $TYPE {}
 
@@ -376,7 +376,7 @@ macro_rules! impl_timer {
     ($module:ident: ($TYPE:ident, $INT:ident, $apbenr:ident, $enrbit:expr, $apbrstr:ident, $rstrbit:expr, $ppre:ident, $pclk: ident), 1) => {
         mod $module {
             use super::*;
-            use stm32f4xx_hal::pac::{$TYPE, RCC};
+            use crate::hal::pac::{$TYPE, RCC};
 
             impl sealed::Sealed for $TYPE {}