diff --git a/embassy-stm32/src/rcc/u5.rs b/embassy-stm32/src/rcc/u5.rs
index 93a327be7..ff70466b9 100644
--- a/embassy-stm32/src/rcc/u5.rs
+++ b/embassy-stm32/src/rcc/u5.rs
@@ -97,14 +97,14 @@ pub struct Config {
     pub mux: super::mux::ClockMux,
 }
 
-impl Default for Config {
-    fn default() -> Self {
+impl Config {
+    pub const fn new() -> Self {
         Self {
             msis: Some(Msirange::RANGE_4MHZ),
             msik: Some(Msirange::RANGE_4MHZ),
             hse: None,
             hsi: false,
-            hsi48: Some(Default::default()),
+            hsi48: Some(crate::rcc::Hsi48Config::new()),
             pll1: None,
             pll2: None,
             pll3: None,
@@ -114,12 +114,18 @@ impl Default for Config {
             apb2_pre: APBPrescaler::DIV1,
             apb3_pre: APBPrescaler::DIV1,
             voltage_range: VoltageScale::RANGE1,
-            ls: Default::default(),
-            mux: Default::default(),
+            ls: crate::rcc::LsConfig::new(),
+            mux: super::mux::ClockMux::default(),
         }
     }
 }
 
+impl Default for Config {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 pub(crate) unsafe fn init(config: Config) {
     // Set the requested power mode
     PWR.vosr().modify(|w| w.set_vos(config.voltage_range));