diff --git a/embassy-stm32/src/rcc/h.rs b/embassy-stm32/src/rcc/h.rs
index 9ac2115f0..352e10816 100644
--- a/embassy-stm32/src/rcc/h.rs
+++ b/embassy-stm32/src/rcc/h.rs
@@ -721,7 +721,7 @@ fn init_pll(num: usize, config: Option<Pll>, input: &PllInput) -> PllOutput {
     } else if wide_allowed && VCO_WIDE_RANGE.contains(&vco_clk) {
         Pllvcosel::WIDEVCO
     } else {
-        panic!("pll vco_clk out of range: {} mhz", vco_clk.0)
+        panic!("pll vco_clk out of range: {} hz", vco_clk.0)
     };
 
     let p = config.divp.map(|div| {