diff --git a/embassy-stm32/src/rcc/h7.rs b/embassy-stm32/src/rcc/h7.rs
index f3a98c79..7e5cd0d1 100644
--- a/embassy-stm32/src/rcc/h7.rs
+++ b/embassy-stm32/src/rcc/h7.rs
@@ -740,7 +740,7 @@ mod pll {
             }
         };
 
-        let vco_ck = output + pll_x_p;
+        let vco_ck = output * pll_x_p;
 
         assert!(pll_x_p < 128);
         assert!(vco_ck >= VCO_MIN);