diff --git a/pythaitts/pretrained/khanomtan_tts.py b/pythaitts/pretrained/khanomtan_tts.py
index c895cfb..9e94fe5 100644
--- a/pythaitts/pretrained/khanomtan_tts.py
+++ b/pythaitts/pretrained/khanomtan_tts.py
@@ -11,7 +11,6 @@
 This model uses the TTS package from: `https://github.com/idiap/coqui-ai-TTS <https://github.com/idiap/coqui-ai-TTS>`_
 """
 import tempfile
-from TTS.utils.synthesizer import Synthesizer
 from huggingface_hub import hf_hub_download
 
 
@@ -46,7 +45,13 @@ def load_synthesizer(self, mode):
         """
         mode: The model mode (best_mode or last_checkpoint)
         """
-        if mode=="best_model":
+        try:
+            from TTS.utils.synthesizer import Synthesizer
+        except ImportError:
+            raise ImportError(
+                "You must install coqui-tts before using this model: pip install coqui-tts"
+            )
+        if mode == "best_model":
             self.best_model_path = hf_hub_download(repo_id="wannaphong/khanomtan-tts-v{0}".format(self.version),filename=self.best_model_path_name,force_filename="best_model-v{0}.pth".format(self.version))
             self.synthesizer = Synthesizer(
                 tts_checkpoint=self.best_model_path,
diff --git a/tests/test_khanomtan.py b/tests/test_khanomtan.py
new file mode 100644
index 0000000..0630908
--- /dev/null
+++ b/tests/test_khanomtan.py
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+"""
+Unit tests for KhanomTan TTS integration
+"""
+import sys
+import unittest
+from unittest.mock import patch, MagicMock
+
+
+class TestKhanomTanImportError(unittest.TestCase):
+    """Test that a helpful ImportError is raised when coqui-tts is not installed"""
+
+    def test_import_error_when_tts_not_installed(self):
+        """Test that ImportError with helpful message is raised when TTS package is missing"""
+        with patch.dict(sys.modules, {"TTS": None, "TTS.utils": None, "TTS.utils.synthesizer": None}):
+            # Remove cached module if present
+            for key in list(sys.modules.keys()):
+                if key.startswith("pythaitts.pretrained.khanomtan"):
+                    del sys.modules[key]
+
+            from pythaitts.pretrained.khanomtan_tts import KhanomTan
+
+            instance = KhanomTan.__new__(KhanomTan)
+            instance.version = "1.0"
+            instance.best_model_path_name = "best_model.pth"
+            instance.last_checkpoint_model_path_name = "checkpoint_440000.pth"
+            instance.config_path = "config.json"
+            instance.speakers_path = "speakers.pth"
+            instance.languages_path = "language_ids.json"
+            instance.speaker_encoder_model_path = "model_se.pth"
+            instance.speaker_encoder_config_path = "config_se.json"
+            instance.synthesizer = None
+
+            with self.assertRaises(ImportError) as ctx:
+                instance.load_synthesizer("last_checkpoint")
+
+            self.assertIn("coqui-tts", str(ctx.exception))
+            self.assertIn("pip install", str(ctx.exception))
+
+
+if __name__ == "__main__":
+    unittest.main()