diff --git a/embassy-stm32/src/adc/mod.rs b/embassy-stm32/src/adc/mod.rs
index 7a7d7cd8e..f20585ec3 100644
--- a/embassy-stm32/src/adc/mod.rs
+++ b/embassy-stm32/src/adc/mod.rs
@@ -77,7 +77,7 @@ pub(crate) fn blocking_delay_us(us: u32) {
     embassy_time::block_for(embassy_time::Duration::from_micros(us as u64));
     #[cfg(not(feature = "time"))]
     {
-        let freq = unsafe { crate::rcc::get_freqs() }.sys.unwrap().0 as u64;
+        let freq = unsafe { crate::rcc::get_freqs() }.sys.to_hertz().unwrap().0 as u64;
         let us = us as u64;
         let cycles = freq * us / 1_000_000;
         cortex_m::asm::delay(cycles as u32);
diff --git a/embassy-stm32/src/dsihost.rs b/embassy-stm32/src/dsihost.rs
index 51f124542..77c3d95c3 100644
--- a/embassy-stm32/src/dsihost.rs
+++ b/embassy-stm32/src/dsihost.rs
@@ -14,7 +14,7 @@ pub fn blocking_delay_ms(ms: u32) {
     #[cfg(feature = "time")]
     embassy_time::block_for(embassy_time::Duration::from_millis(ms as u64));
     #[cfg(not(feature = "time"))]
-    cortex_m::asm::delay(unsafe { crate::rcc::get_freqs() }.sys.unwrap().0 / 1_000 * ms);
+    cortex_m::asm::delay(unsafe { crate::rcc::get_freqs() }.sys.to_hertz().unwrap().0 / 1_000 * ms);
 }
 
 /// PacketTypes extracted from CubeMX
diff --git a/embassy-stm32/src/rtc/low_power.rs b/embassy-stm32/src/rtc/low_power.rs
index a4ff1acbc..b9aaa63b9 100644
--- a/embassy-stm32/src/rtc/low_power.rs
+++ b/embassy-stm32/src/rtc/low_power.rs
@@ -132,7 +132,7 @@ impl Rtc {
 
         // Panic if the rcc mod knows we're not using low-power rtc
         #[cfg(any(rcc_wb, rcc_f4, rcc_f410))]
-        unsafe { crate::rcc::get_freqs() }.rtc.unwrap();
+        unsafe { crate::rcc::get_freqs() }.rtc.to_hertz().unwrap();
 
         let requested_duration = requested_duration.as_ticks().clamp(0, u32::MAX as u64);
         let rtc_hz = Self::frequency().0 as u64;
diff --git a/embassy-stm32/src/usb/usb.rs b/embassy-stm32/src/usb/usb.rs
index 1d9d19a73..9384c8688 100644
--- a/embassy-stm32/src/usb/usb.rs
+++ b/embassy-stm32/src/usb/usb.rs
@@ -270,7 +270,7 @@ impl<'d, T: Instance> Driver<'d, T> {
         #[cfg(feature = "time")]
         embassy_time::block_for(embassy_time::Duration::from_millis(100));
         #[cfg(not(feature = "time"))]
-        cortex_m::asm::delay(unsafe { crate::rcc::get_freqs() }.sys.unwrap().0 / 10);
+        cortex_m::asm::delay(unsafe { crate::rcc::get_freqs() }.sys.to_hertz().unwrap().0 / 10);
 
         #[cfg(not(usb_v4))]
         regs.btable().write(|w| w.set_btable(0));