diff --git a/src/mock.rs b/src/mock.rs
index c63133c..3be78db 100644
--- a/src/mock.rs
+++ b/src/mock.rs
@@ -47,8 +47,8 @@ pub trait Hooks {
     ) -> Result<Option<String>, PragmaErr> {
         Err(PragmaErr::NotFound)
     }
-    fn sector_size(&mut self) {}
-    fn device_characteristics(&mut self) {
+    fn sector_size(&mut self, handle: MockHandle) {}
+    fn device_characteristics(&mut self, handle: MockHandle) {
         println!("device_characteristics");
     }
 }
@@ -297,17 +297,17 @@ impl Vfs for MockVfs {
         state.hooks.pragma(*meta, pragma)
     }
 
-    fn sector_size(&self) -> i32 {
+    fn sector_size(&self, handle: &mut Self::Handle) -> VfsResult<i32> {
         let mut state = self.state();
         state.log(format_args!("sector_size"));
-        state.hooks.sector_size();
-        DEFAULT_SECTOR_SIZE
+        state.hooks.sector_size(*handle);
+        Ok(DEFAULT_SECTOR_SIZE)
     }
 
-    fn device_characteristics(&self) -> i32 {
+    fn device_characteristics(&self, handle: &mut Self::Handle) -> VfsResult<i32> {
         let mut state = self.state();
         state.log(format_args!("device_characteristics"));
-        state.hooks.device_characteristics();
-        DEFAULT_DEVICE_CHARACTERISTICS
+        state.hooks.device_characteristics(*handle);
+        Ok(DEFAULT_DEVICE_CHARACTERISTICS)
     }
 }
diff --git a/src/vfs.rs b/src/vfs.rs
index 8a06dc6..186e432 100644
--- a/src/vfs.rs
+++ b/src/vfs.rs
@@ -179,12 +179,12 @@ pub trait Vfs: Send + Sync {
     }
 
     // system queries
-    fn sector_size(&self) -> i32 {
-        DEFAULT_SECTOR_SIZE
+    fn sector_size(&self, handle: &mut Self::Handle) -> VfsResult<i32> {
+        Ok(DEFAULT_SECTOR_SIZE)
     }
 
-    fn device_characteristics(&self) -> i32 {
-        DEFAULT_DEVICE_CHARACTERISTICS
+    fn device_characteristics(&self, handle: &mut Self::Handle) -> VfsResult<i32> {
+        Ok(DEFAULT_DEVICE_CHARACTERISTICS)
     }
 }
 
@@ -623,7 +623,7 @@ unsafe extern "C" fn x_sector_size<T: Vfs>(p_file: *mut ffi::sqlite3_file) -> c_
     fallible(|| {
         let file = unwrap_file!(p_file, T)?;
         let vfs = unwrap_vfs!(file.vfs, T)?;
-        Ok(vfs.sector_size())
+        vfs.sector_size(unsafe { file.handle.assume_init_mut() })
     })
 }
 
@@ -631,7 +631,7 @@ unsafe extern "C" fn x_device_characteristics<T: Vfs>(p_file: *mut ffi::sqlite3_
     fallible(|| {
         let file = unwrap_file!(p_file, T)?;
         let vfs = unwrap_vfs!(file.vfs, T)?;
-        Ok(vfs.device_characteristics())
+        vfs.device_characteristics(unsafe { file.handle.assume_init_mut() })
     })
 }