diff --git a/tests/test_executor.py b/tests/test_executor.py
index b6d4d677..0b738920 100644
--- a/tests/test_executor.py
+++ b/tests/test_executor.py
@@ -99,7 +99,7 @@ def test_run_simulation_success(self):
             sensor_data = executor.run_simulation("input.h5", "output.h5", "options")
 
         normalized_path = os.path.normpath(self.execution_options.binary_path)
-        expected_command = f"{self.execution_options.system_string} " f"{normalized_path} " f"-i input.h5 " f"-o output.h5 " f"options"
+        expected_command = f"{self.execution_options.system_string} " f'"{normalized_path}"' f"-i input.h5 " f"-o output.h5 " f"options"
 
         self.mock_popen.assert_called_once_with(expected_command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, text=True)
         self.mock_proc.communicate.assert_called_once()