diff --git a/check_with_thresholds_as_perfdata.py b/check_with_thresholds_as_perfdata.py
index 8a897a4..6760740 100755
--- a/check_with_thresholds_as_perfdata.py
+++ b/check_with_thresholds_as_perfdata.py
@@ -155,6 +155,16 @@ def append_thresholds_to_perfdata(perfdata, parsed_perfdata, warning, critical):
     return " ".join(sorted(perfdata_strings))
 
 
+def exit_if_command_does_not_start_with_an_opsview_path(command):
+    """Validate that the command is a valid path to a plugin."""
+    command = command.strip("'\"")
+    if not command.startswith("/opt/opsview/monitoringscripts/"):
+        sys.stderr.write(
+            "Error: Command MUST start with a path in the /opt/opsview/monitoringscripts directory\n"
+        )
+        sys.exit(3)
+
+
 def main():
     """Run the plugin command and append warning and critical thresholds as perfdata."""
     args = parse_arguments()
@@ -163,6 +173,8 @@ def main():
         sys.stderr.write("Error: --warning and/or --critical must be provided\n")
         sys.exit(3)
 
+    exit_if_command_does_not_start_with_an_opsview_path(args.command)
+
     result = execute_command(args.command)
     stdout, stderr, return_code = process_command_output(result)
     output, perfdata = extract_perfdata(stdout)
diff --git a/tests/test_check_with_thresholds_as_perfdata.py b/tests/test_check_with_thresholds_as_perfdata.py
index 8b176a6..6779e9a 100644
--- a/tests/test_check_with_thresholds_as_perfdata.py
+++ b/tests/test_check_with_thresholds_as_perfdata.py
@@ -107,7 +107,10 @@ def test_append_multiple_thresholds_to_perfdata(self):
     def test_command_not_found(self, mock_subprocess_run, _mock_stderr):
         mock_result = MagicMock()
         mock_result.stdout = ""
-        mock_result.stderr = "Error: Command not found: /bin/foo\n"
+        mock_result.stderr = (
+            "Error: Command not found: "
+            "/opt/opsview/monitoringscripts/plugins/check_non_existing_plugin\n"
+        )
         mock_result.returncode = 127
         mock_subprocess_run.return_value = mock_result
 
@@ -121,7 +124,7 @@ def test_command_not_found(self, mock_subprocess_run, _mock_stderr):
                 "-c",
                 "90",
                 "-C",
-                "/bin/foo -H localhost",
+                '"/opt/opsview/monitoringscripts/plugins/check_non_existing_plugin -H localhost"',
             ]
             with patch.object(sys, "argv", test_args):
                 try:
@@ -129,7 +132,10 @@ def test_command_not_found(self, mock_subprocess_run, _mock_stderr):
                 except SystemExit as e:
                     self.assertEqual(e.code, 127)
 
-        expected_output = "Error: Command not found: /bin/foo\n"
+        expected_output = (
+            "Error: Command not found: "
+            "/opt/opsview/monitoringscripts/plugins/check_non_existing_plugin\n"
+        )
         self.assertEqual(expected_output, mock_stderr.getvalue())
 
     @patch("sys.stderr", new_callable=StringIO)
@@ -558,6 +564,27 @@ def test_valid_critical_command_output_with_both_warning_and_critical_and_three_
         self.maxDiff = None
         self.assertEqual(expected_output, mock_stdout.getvalue())
 
+    @patch("sys.stderr", new_callable=StringIO)
+    def test_invalid_path_of_command_results_in_error(self, mock_stderr):
+        mock_result = MagicMock()
+
+        with patch("sys.stdout", new_callable=lambda: sys.stdout) as _mock_stdout, patch(
+            "sys.stderr", new_callable=lambda: sys.stderr
+        ) as mock_stderr:
+            test_args = ["script_name", "-w", "80", "-c", "90", "-C", '"/bin/echo foo"']
+            with patch.object(sys, "argv", test_args):
+                try:
+                    main()
+                except SystemExit as e:
+                    self.assertEqual(e.code, 3)
+
+        expected_output = (
+            "Error: Command MUST start with a path in the "
+            "/opt/opsview/monitoringscripts directory\n"
+        )
+        self.maxDiff = None
+        self.assertEqual(expected_output, mock_stderr.getvalue())
+
 
 if __name__ == "__main__":
     unittest.main()  # pragma: no cover