diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7116d39..35f8ae13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -55,6 +55,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Audio export failing when Tauri save dialog returns object instead of string path
+- PyInstaller sidecar packaging now bundles `qwen_tts` source files needed at runtime (fixes missing `_MEI/.../qwen_tts/core/models/modeling_qwen3_tts.py` during model initialization)
 
 ### Added
 - **Makefile** - Comprehensive development workflow automation with commands for setup, development, building, testing, and code quality checks
diff --git a/backend/build_binary.py b/backend/build_binary.py
index 73f21d23..a7157d2f 100644
--- a/backend/build_binary.py
+++ b/backend/build_binary.py
@@ -64,7 +64,9 @@ def build_server():
         '--hidden-import', 'qwen_tts.cli',
         '--copy-metadata', 'qwen-tts',
         '--collect-submodules', 'qwen_tts',
-        '--collect-data', 'qwen_tts',
+        # Ensure qwen_tts Python source files are materialized in the bundle
+        # (needed by runtime code paths that access modeling_qwen3_tts.py by path).
+        '--collect-all', 'qwen_tts',
         # Fix for pkg_resources and jaraco namespace packages
         '--hidden-import', 'pkg_resources.extern',
         '--collect-submodules', 'jaraco',
diff --git a/backend/voicebox-server.spec b/backend/voicebox-server.spec
index feccfae0..80ac622d 100644
--- a/backend/voicebox-server.spec
+++ b/backend/voicebox-server.spec
@@ -1,19 +1,19 @@
 # -*- mode: python ; coding: utf-8 -*-
-from PyInstaller.utils.hooks import collect_data_files
 from PyInstaller.utils.hooks import collect_submodules
 from PyInstaller.utils.hooks import copy_metadata
 
 datas = []
 hiddenimports = ['backend', 'backend.main', 'backend.config', 'backend.database', 'backend.models', 'backend.profiles', 'backend.history', 'backend.tts', 'backend.transcribe', 'backend.platform_detect', 'backend.backends', 'backend.backends.pytorch_backend', 'backend.utils.audio', 'backend.utils.cache', 'backend.utils.progress', 'backend.utils.hf_progress', 'backend.utils.validation', 'torch', 'transformers', 'fastapi', 'uvicorn', 'sqlalchemy', 'librosa', 'soundfile', 'qwen_tts', 'qwen_tts.inference', 'qwen_tts.inference.qwen3_tts_model', 'qwen_tts.inference.qwen3_tts_tokenizer', 'qwen_tts.core', 'qwen_tts.cli', 'pkg_resources.extern', 'backend.backends.mlx_backend', 'mlx', 'mlx.core', 'mlx.nn', 'mlx_audio', 'mlx_audio.tts', 'mlx_audio.stt']
-datas += collect_data_files('qwen_tts')
 # Use collect_all (not collect_data_files) so native .dylib and .metallib
 # files are bundled as binaries, not data. Without this, MLX raises OSError
 # when loading Metal shaders inside the PyInstaller bundle.
 from PyInstaller.utils.hooks import collect_all as _collect_all
+_qwen_datas, _qwen_bins, _qwen_hidden = _collect_all('qwen_tts')
 _mlx_datas, _mlx_bins, _mlx_hidden = _collect_all('mlx')
 _mlxa_datas, _mlxa_bins, _mlxa_hidden = _collect_all('mlx_audio')
-datas += _mlx_datas + _mlxa_datas
+datas += _qwen_datas + _mlx_datas + _mlxa_datas
 datas += copy_metadata('qwen-tts')
+hiddenimports += _qwen_hidden
 hiddenimports += collect_submodules('qwen_tts')
 hiddenimports += collect_submodules('jaraco')
 hiddenimports += collect_submodules('mlx')
@@ -23,7 +23,7 @@ hiddenimports += collect_submodules('mlx_audio')
 a = Analysis(
     ['server.py'],
     pathex=[],
-    binaries=_mlx_bins + _mlxa_bins,
+    binaries=_qwen_bins + _mlx_bins + _mlxa_bins,
     datas=datas,
     hiddenimports=hiddenimports,
     hookspath=[],