diff --git a/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/MapView.rs b/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/MapView.rs
index 72b39f56ec..9176b5d903 100644
--- a/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/MapView.rs
+++ b/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/MapView.rs
@@ -44,7 +44,7 @@ where
         V::from_default(value)
     }
     fn Size(&self) -> ::windows_core::Result<u32> {
-        Ok(self.map.len() as u32)
+        Ok(self.map.len().try_into()?)
     }
     fn HasKey(&self, key: &K::Default) -> ::windows_core::Result<bool> {
         Ok(self.map.contains_key(key))
diff --git a/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/VectorView.rs b/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/VectorView.rs
index cc482b70fd..561681b167 100644
--- a/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/VectorView.rs
+++ b/crates/libs/bindgen/src/rust/extensions/impl/Foundation/Collections/VectorView.rs
@@ -38,7 +38,7 @@ where
         T::from_default(item)
     }
     fn Size(&self) -> ::windows_core::Result<u32> {
-        Ok(self.values.len() as u32)
+        Ok(self.values.len().try_into()?)
     }
     fn IndexOf(&self, value: &T::Default, result: &mut u32) -> ::windows_core::Result<bool> {
         match self.values.iter().position(|element| element == value) {
diff --git a/crates/libs/windows/src/Windows/Foundation/Collections/impl.rs b/crates/libs/windows/src/Windows/Foundation/Collections/impl.rs
index eab17e991e..a991bd562e 100644
--- a/crates/libs/windows/src/Windows/Foundation/Collections/impl.rs
+++ b/crates/libs/windows/src/Windows/Foundation/Collections/impl.rs
@@ -837,7 +837,7 @@ where
         V::from_default(value)
     }
     fn Size(&self) -> ::windows_core::Result<u32> {
-        Ok(self.map.len() as u32)
+        Ok(self.map.len().try_into()?)
     }
     fn HasKey(&self, key: &K::Default) -> ::windows_core::Result<bool> {
         Ok(self.map.contains_key(key))
@@ -981,7 +981,7 @@ where
         T::from_default(item)
     }
     fn Size(&self) -> ::windows_core::Result<u32> {
-        Ok(self.values.len() as u32)
+        Ok(self.values.len().try_into()?)
     }
     fn IndexOf(&self, value: &T::Default, result: &mut u32) -> ::windows_core::Result<bool> {
         match self.values.iter().position(|element| element == value) {