diff --git a/embassy-stm32/src/flash/mod.rs b/embassy-stm32/src/flash/mod.rs
index c704909a..1294ace4 100644
--- a/embassy-stm32/src/flash/mod.rs
+++ b/embassy-stm32/src/flash/mod.rs
@@ -108,6 +108,12 @@ impl Drop for Flash<'_> {
     }
 }
 
+impl Drop for FlashRegions {
+    fn drop(&mut self) {
+        unsafe { family::lock() };
+    }
+}
+
 pub trait FlashRegion {
     const BASE: usize;
     const SIZE: usize;