diff --git a/embassy-stm32/src/rcc/l0.rs b/embassy-stm32/src/rcc/l0.rs
index c3d29f16..42a481a7 100644
--- a/embassy-stm32/src/rcc/l0.rs
+++ b/embassy-stm32/src/rcc/l0.rs
@@ -313,7 +313,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: Ppre = pre.into();
             let pre: u8 = 1 << (pre.0 - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };
diff --git a/embassy-stm32/src/rcc/l1.rs b/embassy-stm32/src/rcc/l1.rs
index e0180b24..c907fa88 100644
--- a/embassy-stm32/src/rcc/l1.rs
+++ b/embassy-stm32/src/rcc/l1.rs
@@ -314,7 +314,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: Ppre = pre.into();
             let pre: u8 = 1 << (pre.0 - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };
diff --git a/embassy-stm32/src/rcc/l4.rs b/embassy-stm32/src/rcc/l4.rs
index c820018a..e650490f 100644
--- a/embassy-stm32/src/rcc/l4.rs
+++ b/embassy-stm32/src/rcc/l4.rs
@@ -483,7 +483,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: Ppre = pre.into();
             let pre: u8 = 1 << (pre.0 - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };
diff --git a/embassy-stm32/src/rcc/l5.rs b/embassy-stm32/src/rcc/l5.rs
index 81bf36be..f56fce36 100644
--- a/embassy-stm32/src/rcc/l5.rs
+++ b/embassy-stm32/src/rcc/l5.rs
@@ -481,7 +481,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: Ppre = pre.into();
             let pre: u8 = 1 << (pre.0 - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };
diff --git a/embassy-stm32/src/rcc/u5.rs b/embassy-stm32/src/rcc/u5.rs
index 2ba339ec..81507a4d 100644
--- a/embassy-stm32/src/rcc/u5.rs
+++ b/embassy-stm32/src/rcc/u5.rs
@@ -481,7 +481,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: u8 = pre.into();
             let pre: u8 = 1 << (pre - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };
@@ -491,7 +491,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: u8 = pre.into();
             let pre: u8 = 1 << (pre - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };
diff --git a/embassy-stm32/src/rcc/wb.rs b/embassy-stm32/src/rcc/wb.rs
index c9ada83e..e6123821 100644
--- a/embassy-stm32/src/rcc/wb.rs
+++ b/embassy-stm32/src/rcc/wb.rs
@@ -151,7 +151,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: u8 = pre.into();
             let pre: u8 = 1 << (pre - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };
diff --git a/embassy-stm32/src/rcc/wl.rs b/embassy-stm32/src/rcc/wl.rs
index 82b0d04e..7072db98 100644
--- a/embassy-stm32/src/rcc/wl.rs
+++ b/embassy-stm32/src/rcc/wl.rs
@@ -240,7 +240,7 @@ pub(crate) unsafe fn init(config: Config) {
         pre => {
             let pre: u8 = pre.into();
             let pre: u8 = 1 << (pre - 3);
-            let freq = ahb_freq / (1 << (pre as u8 - 3));
+            let freq = ahb_freq / pre as u32;
             (freq, freq * 2)
         }
     };