diff --git a/rust/nix-expr/src/eval_state.rs b/rust/nix-expr/src/eval_state.rs
index 60465bb..b9656c2 100644
--- a/rust/nix-expr/src/eval_state.rs
+++ b/rust/nix-expr/src/eval_state.rs
@@ -111,8 +111,8 @@ impl EvalState {
         unsafe {
             let value = self.new_value_uninitialized()?;
             check_call!(raw::expr_eval_from_string[
-                self.context,
-                self.raw_ptr(),
+                &mut self.context,
+                self.eval_state.as_ptr(),
                 expr_ptr.as_ptr(),
                 path_ptr.as_ptr(),
                 value.raw_ptr()
@@ -122,7 +122,9 @@ impl EvalState {
     }
     /// Try turn any Value into a Value that isn't a Thunk.
     pub fn force(&mut self, v: &Value) -> Result<()> {
-        unsafe { check_call!(raw::value_force[self.context, self.raw_ptr(), v.raw_ptr()]) }?;
+        unsafe {
+            check_call!(raw::value_force[&mut self.context, self.eval_state.as_ptr(), v.raw_ptr()])
+        }?;
         Ok(())
     }
     pub fn value_type_unforced(&mut self, value: &Value) -> Option<ValueType> {
@@ -168,9 +170,9 @@ impl EvalState {
         for i in 0..n {
             let cstr_ptr: *const i8 = unsafe {
                 check_call!(raw::get_attr_name_byidx[
-                    self.context,
+                    &mut self.context,
                     v.raw_ptr(),
-                    self.raw_ptr(),
+                    self.eval_state.as_ptr(),
                     i as c_uint
                 ])
             }?;
@@ -193,9 +195,9 @@ impl EvalState {
             .with_context(|| "require_attrs_select: attrName contains null byte")?;
         let v2 = unsafe {
             check_call!(raw::get_attr_byname[
-                self.context,
+                &mut self.context,
                 v.raw_ptr(),
-                self.raw_ptr(),
+                self.eval_state.as_ptr(),
                 attr_name.as_ptr()
             ])
         }?;
@@ -289,8 +291,8 @@ impl EvalState {
 
         let rs = unsafe {
             check_call!(raw::string_realise[
-                self.context,
-                self.raw_ptr(),
+                &mut self.context,
+                self.eval_state.as_ptr(),
                 value.raw_ptr(),
                 is_import_from_derivation
             ])
@@ -329,8 +331,8 @@ impl EvalState {
         let value = self.new_value_uninitialized()?;
         unsafe {
             check_call!(raw::value_call[
-                self.context,
-                self.raw_ptr(),
+                &mut self.context,
+                self.eval_state.as_ptr(),
                 f.raw_ptr(),
                 a.raw_ptr(),
                 value.raw_ptr()
@@ -346,7 +348,7 @@ impl EvalState {
         let value = self.new_value_uninitialized()?;
         unsafe {
             check_call!(raw::init_apply[
-                self.context,
+                &mut self.context,
                 value.raw_ptr(),
                 f.raw_ptr(),
                 a.raw_ptr()
@@ -356,7 +358,8 @@ impl EvalState {
     }
 
     fn new_value_uninitialized(&mut self) -> Result<Value> {
-        let value = unsafe { check_call!(raw::alloc_value[self.context, self.raw_ptr()]) }?;
+        let value =
+            unsafe { check_call!(raw::alloc_value[&mut self.context, self.eval_state.as_ptr()]) }?;
         Ok(Value::new(value))
     }
 }
diff --git a/rust/nix-util/src/context.rs b/rust/nix-util/src/context.rs
index 3b9cf36..5a47ac6 100644
--- a/rust/nix-util/src/context.rs
+++ b/rust/nix-util/src/context.rs
@@ -96,11 +96,12 @@ impl Drop for Context {
 macro_rules! check_call {
     ($f:path[$ctx:expr $(, $arg:expr)*]) => {
         {
-            let ret = $f($ctx.ptr() $(, $arg)*);
-            match $ctx.check_err() {
+            let ctx : &mut $crate::context::Context = $ctx;
+            let ret = $f(ctx.ptr() $(, $arg)*);
+            match ctx.check_err() {
                 Ok(_) => Ok(ret),
                 Err(e) => {
-                    $ctx.clear();
+                    ctx.clear();
                     Err(e)
                 }
             }
@@ -142,4 +143,21 @@ mod tests {
         // don't crash
         let _c = Context::new();
     }
+
+    fn set_dummy_err(ctx_ptr: *mut raw::c_context) {
+        unsafe {
+            raw::set_err_msg(
+                ctx_ptr,
+                raw::NIX_ERR_UNKNOWN.try_into().unwrap(),
+                b"dummy error message\0".as_ptr() as *const i8,
+            );
+        }
+    }
+
+    #[test]
+    fn check_call_dynamic_context() {
+        let r = check_call!(set_dummy_err[&mut Context::new()]);
+        assert!(r.is_err());
+        assert_eq!(r.unwrap_err().to_string(), "dummy error message");
+    }
 }
diff --git a/rust/nix-util/src/settings.rs b/rust/nix-util/src/settings.rs
index 3cce59c..138ffe6 100644
--- a/rust/nix-util/src/settings.rs
+++ b/rust/nix-util/src/settings.rs
@@ -40,7 +40,7 @@ mod tests {
     fn setup() {
         let mut ctx = context::Context::new();
         unsafe {
-            check_call!(raw::libstore_init[ctx]).unwrap();
+            check_call!(raw::libstore_init[&mut ctx]).unwrap();
         }
     }