diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 7f84b1972..3dfce9b7d 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -1554,8 +1554,6 @@ class _PosixSpawnMixin:
         with open(pidfile) as f:
             self.assertEqual(f.read(), str(pid))
 
-    # TODO: RUSTPYTHON: AssertionError: None != 'no_such_executable'
-    @unittest.expectedFailure
     def test_no_such_executable(self):
         no_such_executable = 'no_such_executable'
         try:
diff --git a/vm/src/stdlib/posix.rs b/vm/src/stdlib/posix.rs
index 90e244de5..3d841cba4 100644
--- a/vm/src/stdlib/posix.rs
+++ b/vm/src/stdlib/posix.rs
@@ -1278,7 +1278,10 @@ pub mod module {
         fn spawn(self, spawnp: bool, vm: &VirtualMachine) -> PyResult<libc::pid_t> {
             use crate::TryFromBorrowedObject;
 
-            let path = CString::new(self.path.into_bytes())
+            let path = self
+                .path
+                .clone()
+                .into_cstring(vm)
                 .map_err(|_| vm.new_value_error("path should not have nul bytes".to_owned()))?;
 
             let mut file_actions = unsafe {
@@ -1331,7 +1334,9 @@ pub mod module {
                         }
                     };
                     if ret != 0 {
-                        return Err(errno_err(vm));
+                        return Err(IOErrorBuilder::new(std::io::Error::from_raw_os_error(ret))
+                            .filename(self.path)
+                            .into_pyexception(vm));
                     }
                 }
             }
@@ -1403,7 +1408,9 @@ pub mod module {
             if ret == 0 {
                 Ok(pid)
             } else {
-                Err(errno_err(vm))
+                Err(IOErrorBuilder::new(std::io::Error::from_raw_os_error(ret))
+                    .filename(self.path)
+                    .into_pyexception(vm))
             }
         }
     }