diff --git a/ci.sh b/ci.sh
index c246e6a98..ece763497 100755
--- a/ci.sh
+++ b/ci.sh
@@ -204,6 +204,7 @@ cargo batch  \
     --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7m-none-eabi --features stm32f207zg --out-dir out/tests/stm32f207zg \
     --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32f303ze --out-dir out/tests/stm32f303ze \
     --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32l496zg --out-dir out/tests/stm32l496zg \
+    --- build --release --manifest-path tests/stm32/Cargo.toml --target thumbv7em-none-eabi --features stm32wl55jc --out-dir out/tests/stm32wl55jc \
     --- build --release --manifest-path tests/rp/Cargo.toml --target thumbv6m-none-eabi --out-dir out/tests/rpi-pico \
     --- build --release --manifest-path tests/nrf/Cargo.toml --target thumbv7em-none-eabi --out-dir out/tests/nrf52840-dk \
     --- build --release --manifest-path tests/riscv32/Cargo.toml --target riscv32imac-unknown-none-elf \
diff --git a/examples/stm32wl/src/bin/random.rs b/examples/stm32wl/src/bin/random.rs
index 7c7e8a4e6..70676c704 100644
--- a/examples/stm32wl/src/bin/random.rs
+++ b/examples/stm32wl/src/bin/random.rs
@@ -4,6 +4,7 @@
 
 use defmt::*;
 use embassy_executor::Spawner;
+use embassy_stm32::rcc::{ClockSrc, MSIRange};
 use embassy_stm32::rng::{self, Rng};
 use embassy_stm32::{bind_interrupts, pac, peripherals};
 use {defmt_rtt as _, panic_probe as _};
@@ -15,12 +16,10 @@ bind_interrupts!(struct Irqs{
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut config = embassy_stm32::Config::default();
-    config.rcc.mux = embassy_stm32::rcc::ClockSrc::HSE;
-
+    config.rcc.mux = ClockSrc::MSI(MSIRange::RANGE32M);
     let p = embassy_stm32::init(config);
-    pac::RCC.ccipr().modify(|w| {
-        w.set_rngsel(0b01);
-    });
+
+    pac::RCC.ccipr().modify(|w| w.set_rngsel(0b11)); // msi
 
     info!("Hello World!");
 
diff --git a/tests/stm32/Cargo.toml b/tests/stm32/Cargo.toml
index 77991ead3..b1b2f55c3 100644
--- a/tests/stm32/Cargo.toml
+++ b/tests/stm32/Cargo.toml
@@ -24,6 +24,7 @@ stm32f767zi = ["embassy-stm32/stm32f767zi", "chrono", "not-gpdma", "eth", "rng"]
 stm32f207zg = ["embassy-stm32/stm32f207zg", "chrono", "not-gpdma", "eth", "rng"]
 stm32f303ze = ["embassy-stm32/stm32f303ze", "chrono", "not-gpdma"]
 stm32l496zg = ["embassy-stm32/stm32l496zg", "not-gpdma", "rng"]
+stm32wl55jc = ["embassy-stm32/stm32wl55jc-cm4", "not-gpdma", "rng", "chrono"]
 
 eth = []
 rng = []
diff --git a/tests/stm32/build.rs b/tests/stm32/build.rs
index 9aabf8541..c5d0e40d6 100644
--- a/tests/stm32/build.rs
+++ b/tests/stm32/build.rs
@@ -8,12 +8,14 @@ fn main() -> Result<(), Box<dyn Error>> {
     println!("cargo:rustc-link-search={}", out.display());
     println!("cargo:rustc-link-arg-bins=--nmagic");
 
-    // too little RAM to run from RAM.
     if cfg!(any(
+        // too little RAM to run from RAM.
         feature = "stm32f103c8",
         feature = "stm32c031c6",
         feature = "stm32wb55rg",
         feature = "stm32l073rz",
+        // wrong ram size in stm32-data
+        feature = "stm32wl55jc",
     )) {
         println!("cargo:rustc-link-arg-bins=-Tlink.x");
         println!("cargo:rerun-if-changed=link.x");
diff --git a/tests/stm32/src/common.rs b/tests/stm32/src/common.rs
index a802cdfcf..52edae3ac 100644
--- a/tests/stm32/src/common.rs
+++ b/tests/stm32/src/common.rs
@@ -42,6 +42,8 @@ teleprobe_meta::target!(b"nucleo-stm32f207zg");
 teleprobe_meta::target!(b"nucleo-stm32f303ze");
 #[cfg(feature = "stm32l496zg")]
 teleprobe_meta::target!(b"nucleo-stm32l496zg");
+#[cfg(feature = "stm32wl55jc")]
+teleprobe_meta::target!(b"nucleo-stm32wl55jc");
 
 macro_rules! define_peris {
     ($($name:ident = $peri:ident,)* $(@irq $irq_name:ident = $irq_code:tt,)*) => {
@@ -181,6 +183,12 @@ define_peris!(
     SPI = SPI1, SPI_SCK = PA5, SPI_MOSI = PA7, SPI_MISO = PA6, SPI_TX_DMA = DMA1_CH3, SPI_RX_DMA = DMA1_CH2,
     @irq UART = {USART1 => embassy_stm32::usart::InterruptHandler<embassy_stm32::peripherals::USART1>;},
 );
+#[cfg(feature = "stm32wl55jc")]
+define_peris!(
+    UART = USART1, UART_TX = PB6, UART_RX = PB7, UART_TX_DMA = DMA1_CH4, UART_RX_DMA = DMA1_CH5,
+    SPI = SPI1, SPI_SCK = PA5, SPI_MOSI = PA7, SPI_MISO = PA6, SPI_TX_DMA = DMA1_CH3, SPI_RX_DMA = DMA1_CH2,
+    @irq UART = {USART1 => embassy_stm32::usart::InterruptHandler<embassy_stm32::peripherals::USART1>;},
+);
 
 pub fn config() -> Config {
     #[allow(unused_mut)]
@@ -299,6 +307,15 @@ pub fn config() -> Config {
         });
     }
 
+    #[cfg(feature = "stm32wl55jc")]
+    {
+        use embassy_stm32::rcc::*;
+        config.rcc.mux = ClockSrc::MSI(MSIRange::RANGE32M);
+        embassy_stm32::pac::RCC.ccipr().modify(|w| {
+            w.set_rngsel(0b11); // msi
+        });
+    }
+
     #[cfg(any(feature = "stm32l552ze"))]
     {
         use embassy_stm32::rcc::*;