diff --git a/kt-kernel/python/cli/commands/config.py b/kt-kernel/python/cli/commands/config.py
index 84f24759f..551767b34 100644
--- a/kt-kernel/python/cli/commands/config.py
+++ b/kt-kernel/python/cli/commands/config.py
@@ -137,10 +137,10 @@ def model_path_remove(
 
 def _parse_value(value: str):
     """Parse a string value into appropriate Python type."""
-    # Try boolean
-    if value.lower() in ("true", "yes", "on", "1"):
+    # Try boolean ("1"/"0" fall through to int so e.g. CUDA_VISIBLE_DEVICES=1 stays "1")
+    if value.lower() in ("true", "yes", "on"):
         return True
-    if value.lower() in ("false", "no", "off", "0"):
+    if value.lower() in ("false", "no", "off"):
         return False
 
     # Try integer
diff --git a/kt-kernel/test/per_commit/test_config_parse_value.py b/kt-kernel/test/per_commit/test_config_parse_value.py
new file mode 100644
index 000000000..7c672eacd
--- /dev/null
+++ b/kt-kernel/test/per_commit/test_config_parse_value.py
@@ -0,0 +1,44 @@
+import tempfile
+import unittest
+from pathlib import Path
+
+import yaml
+
+from ci.ci_register import register_cpu_ci
+from kt_kernel.cli.commands.config import _parse_value
+from kt_kernel.cli.config.settings import Settings
+
+
+register_cpu_ci(est_time=0.1, suite="default")
+
+
+class TestConfigParseValue(unittest.TestCase):
+    def test_numeric_strings_stay_integers(self):
+        for raw, expected in (("0", 0), ("1", 1), ("2", 2), ("30000", 30000)):
+            value = _parse_value(raw)
+            self.assertIs(type(value), int, raw)
+            self.assertEqual(value, expected)
+
+    def test_boolean_words_still_parse_as_booleans(self):
+        for raw in ("true", "True", "yes", "on"):
+            self.assertIs(_parse_value(raw), True, raw)
+        for raw in ("false", "False", "no", "off"):
+            self.assertIs(_parse_value(raw), False, raw)
+
+    def test_env_var_set_to_one_is_exported_as_one(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            tmp = Path(tmp)
+            config_path = tmp / "config.yaml"
+            # Keep every directory Settings creates inside the temp dir.
+            config_path.write_text(
+                yaml.safe_dump({"paths": {"models": str(tmp / "models"), "cache": str(tmp / "cache")}}),
+                encoding="utf-8",
+            )
+
+            Settings(config_path=config_path).set("advanced.env.CUDA_VISIBLE_DEVICES", _parse_value("1"))
+
+            self.assertEqual(Settings(config_path=config_path).get_env_vars(), {"CUDA_VISIBLE_DEVICES": "1"})
+
+
+if __name__ == "__main__":
+    unittest.main()