diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ab3a7a4..f71ab77 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -174,7 +174,7 @@ jobs:
       run: cargo test --verbose --workspace --exclude netcdf-src --features netcdf/mpi,derive
 
     - name: Run example
-      run: cargo run --verbose --package netcdf-examples --features mpi,derive
+      run: cargo run --verbose --package netcdf-examples --features mpi
 
     - name: Run example in parallel
       run: mpirun -np 10 --oversubscribe -- target/debug/netcdf-examples
diff --git a/netcdf/src/file.rs b/netcdf/src/file.rs
index dff215b..ef0e287 100644
--- a/netcdf/src/file.rs
+++ b/netcdf/src/file.rs
@@ -97,7 +97,7 @@ impl RawFile {
         let f = get_ffi_from_path(path);
         let mut ncid: nc_type = 0;
         unsafe {
-            error::checked(super::with_lock(|| {
+            error::checked(with_lock(|| {
                 netcdf_sys::par::nc_open_par(
                     f.as_ptr().cast(),
                     options.bits(),
@@ -140,7 +140,7 @@ impl RawFile {
         let f = get_ffi_from_path(path);
         let mut ncid: nc_type = -1;
         unsafe {
-            error::checked(super::with_lock(|| {
+            error::checked(with_lock(|| {
                 netcdf_sys::par::nc_create_par(
                     f.as_ptr().cast(),
                     options.bits(),
@@ -500,16 +500,12 @@ impl FileMut {
 
     /// Open the file for new definitions
     pub fn redef(&mut self) -> error::Result<()> {
-        error::checked(super::with_lock(|| unsafe {
-            netcdf_sys::nc_redef(self.ncid())
-        }))
+        error::checked(with_lock(|| unsafe { netcdf_sys::nc_redef(self.ncid()) }))
     }
 
     /// Close the file for new definitions
     pub fn enddef(&mut self) -> error::Result<()> {
-        error::checked(super::with_lock(|| unsafe {
-            netcdf_sys::nc_enddef(self.ncid())
-        }))
+        error::checked(with_lock(|| unsafe { netcdf_sys::nc_enddef(self.ncid()) }))
     }
 }
 
diff --git a/netcdf/src/par.rs b/netcdf/src/par.rs
index 51855ba..d99586d 100644
--- a/netcdf/src/par.rs
+++ b/netcdf/src/par.rs
@@ -1,6 +1,6 @@
 use crate::{
     error::{checked, Result},
-    with_lock,
+    utils::with_lock,
 };
 
 use netcdf_sys::nc_type;
diff --git a/netcdf/src/variable.rs b/netcdf/src/variable.rs
index 13a8a8f..1386f68 100644
--- a/netcdf/src/variable.rs
+++ b/netcdf/src/variable.rs
@@ -194,7 +194,7 @@ impl<'g> Variable<'g> {
 
     #[cfg(feature = "mpi")]
     fn access_mode(&self, mode: crate::par::AccessMode) -> error::Result<()> {
-        error::checked(super::with_lock(|| unsafe {
+        error::checked(utils::with_lock(|| unsafe {
             netcdf_sys::par::nc_var_par_access(
                 self.ncid,
                 self.varid,