diff --git a/embassy-stm32/build.rs b/embassy-stm32/build.rs
index b35fd0300..eb0437bc2 100644
--- a/embassy-stm32/build.rs
+++ b/embassy-stm32/build.rs
@@ -296,6 +296,8 @@ fn main() {
                 "Bank1"
             } else if region.name.starts_with("BANK_2") {
                 "Bank2"
+            } else if region.name == "OTP" {
+                "Otp"
             } else {
                 continue;
             }
diff --git a/embassy-stm32/src/flash/f4.rs b/embassy-stm32/src/flash/f4.rs
index d818c77d0..86afdce8a 100644
--- a/embassy-stm32/src/flash/f4.rs
+++ b/embassy-stm32/src/flash/f4.rs
@@ -15,7 +15,7 @@ mod alt_regions {
 
     use embassy_hal_internal::PeripheralRef;
 
-    use crate::_generated::flash_regions::{BANK1_REGION1, BANK1_REGION2, BANK1_REGION3};
+    use crate::_generated::flash_regions::{OTPRegion, BANK1_REGION1, BANK1_REGION2, BANK1_REGION3, OTP_REGION};
     use crate::_generated::FLASH_SIZE;
     use crate::flash::{asynch, Async, Bank1Region1, Bank1Region2, Blocking, Error, Flash, FlashBank, FlashRegion};
     use crate::peripherals::FLASH;
@@ -62,6 +62,7 @@ mod alt_regions {
         pub bank2_region1: AltBank2Region1<'d, MODE>,
         pub bank2_region2: AltBank2Region2<'d, MODE>,
         pub bank2_region3: AltBank2Region3<'d, MODE>,
+        pub otp_region: OTPRegion<'d, MODE>,
     }
 
     impl<'d> Flash<'d> {
@@ -78,6 +79,7 @@ mod alt_regions {
                 bank2_region1: AltBank2Region1(&ALT_BANK2_REGION1, unsafe { p.clone_unchecked() }, PhantomData),
                 bank2_region2: AltBank2Region2(&ALT_BANK2_REGION2, unsafe { p.clone_unchecked() }, PhantomData),
                 bank2_region3: AltBank2Region3(&ALT_BANK2_REGION3, unsafe { p.clone_unchecked() }, PhantomData),
+                otp_region: OTPRegion(&OTP_REGION, unsafe { p.clone_unchecked() }, PhantomData),
             }
         }
 
@@ -94,6 +96,7 @@ mod alt_regions {
                 bank2_region1: AltBank2Region1(&ALT_BANK2_REGION1, unsafe { p.clone_unchecked() }, PhantomData),
                 bank2_region2: AltBank2Region2(&ALT_BANK2_REGION2, unsafe { p.clone_unchecked() }, PhantomData),
                 bank2_region3: AltBank2Region3(&ALT_BANK2_REGION3, unsafe { p.clone_unchecked() }, PhantomData),
+                otp_region: OTPRegion(&OTP_REGION, unsafe { p.clone_unchecked() }, PhantomData),
             }
         }
     }
diff --git a/embassy-stm32/src/flash/h5.rs b/embassy-stm32/src/flash/h5.rs
index 9e131ca2b..d95de2e38 100644
--- a/embassy-stm32/src/flash/h5.rs
+++ b/embassy-stm32/src/flash/h5.rs
@@ -114,6 +114,7 @@ pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), E
         r.set_bksel(match sector.bank {
             crate::flash::FlashBank::Bank1 => stm32_metapac::flash::vals::NscrBksel::B_0X0,
             crate::flash::FlashBank::Bank2 => stm32_metapac::flash::vals::NscrBksel::B_0X1,
+            _ => unreachable!(),
         });
         r.set_snb(sector.index_in_bank);
         r.set_ser(true);
diff --git a/embassy-stm32/src/flash/h50.rs b/embassy-stm32/src/flash/h50.rs
index 82e77d130..74cd6cc03 100644
--- a/embassy-stm32/src/flash/h50.rs
+++ b/embassy-stm32/src/flash/h50.rs
@@ -55,6 +55,7 @@ pub(crate) unsafe fn blocking_write(start_address: u32, buf: &[u8; WRITE_SIZE])
 }
 
 pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), Error> {
+    assert!(sector.bank != FlashBank::Otp);
     assert!(sector.index_in_bank < 8);
 
     while busy() {}
@@ -67,6 +68,7 @@ pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), E
                 (FlashBank::Bank2, true) => Bksel::BANK1,
                 (FlashBank::Bank2, false) => Bksel::BANK2,
                 (FlashBank::Bank1, true) => Bksel::BANK2,
+                _ => unreachable!(),
             });
             w.set_snb(sector.index_in_bank);
             w.set_ser(true);
diff --git a/embassy-stm32/src/flash/mod.rs b/embassy-stm32/src/flash/mod.rs
index b564de093..c7488c8ef 100644
--- a/embassy-stm32/src/flash/mod.rs
+++ b/embassy-stm32/src/flash/mod.rs
@@ -88,6 +88,8 @@ pub enum FlashBank {
     Bank1 = 0,
     /// Bank 2
     Bank2 = 1,
+    /// OTP region,
+    Otp,
 }
 
 #[cfg_attr(any(flash_l0, flash_l1, flash_l4, flash_l5, flash_wl, flash_wb), path = "l.rs")]
diff --git a/embassy-stm32/src/flash/u5.rs b/embassy-stm32/src/flash/u5.rs
index e5af4f1f7..dad698316 100644
--- a/embassy-stm32/src/flash/u5.rs
+++ b/embassy-stm32/src/flash/u5.rs
@@ -75,6 +75,7 @@ pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), E
         w.set_bker(match sector.bank {
             FlashBank::Bank1 => pac::flash::vals::SeccrBker::B_0X0,
             FlashBank::Bank2 => pac::flash::vals::SeccrBker::B_0X1,
+            _ => unreachable!(),
         });
     });
     #[cfg(not(feature = "trustzone-secure"))]
@@ -85,6 +86,7 @@ pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), E
         w.set_bker(match sector.bank {
             FlashBank::Bank1 => pac::flash::vals::NscrBker::B_0X0,
             FlashBank::Bank2 => pac::flash::vals::NscrBker::B_0X1,
+            _ => unreachable!(),
         });
     });