diff --git a/examples/stm32l4/src/bin/rtc.rs b/examples/stm32l4/src/bin/rtc.rs
index f3f8aa46..eb1eed01 100644
--- a/examples/stm32l4/src/bin/rtc.rs
+++ b/examples/stm32l4/src/bin/rtc.rs
@@ -23,6 +23,7 @@ async fn main(_spawner: Spawner) {
             PLLMul::Mul20,
             None,
         );
+        config.rcc.lse = Some(Hertz(32_768));
         config.rcc.rtc_mux = rcc::RtcClockSource::LSE;
         embassy_stm32::init(config)
     };
diff --git a/examples/stm32wl/src/bin/rtc.rs b/examples/stm32wl/src/bin/rtc.rs
index e123425a..11734e4b 100644
--- a/examples/stm32wl/src/bin/rtc.rs
+++ b/examples/stm32wl/src/bin/rtc.rs
@@ -7,6 +7,7 @@ use defmt::*;
 use embassy_executor::Spawner;
 use embassy_stm32::rcc::ClockSrc;
 use embassy_stm32::rtc::{Rtc, RtcClockSource, RtcConfig};
+use embassy_stm32::time::Hertz;
 use embassy_stm32::Config;
 use embassy_time::{Duration, Timer};
 use {defmt_rtt as _, panic_probe as _};
@@ -16,6 +17,7 @@ async fn main(_spawner: Spawner) {
     let p = {
         let mut config = Config::default();
         config.rcc.mux = ClockSrc::HSE32;
+        config.rcc.lse = Some(Hertz(32_768));
         config.rcc.rtc_mux = RtcClockSource::LSE;
         embassy_stm32::init(config)
     };