diff --git a/corrscope.spec b/corrscope.spec
index e882ab0..2057b4d 100644
--- a/corrscope.spec
+++ b/corrscope.spec
@@ -1,5 +1,6 @@
 import glob
-import zipfile
+import os
+import shutil
 from pathlib import Path
 
 from PyInstaller.building.api import PYZ, EXE, COLLECT
@@ -8,7 +9,6 @@ from PyInstaller.building.datastruct import TOC
 
 from corrscope import version as v
 
-
 block_cipher = None
 
 
@@ -103,14 +103,15 @@ exe = EXE(
 )
 
 class ZipCollect(COLLECT):
-    name: str   # absolute-ish path, != __init__(name=)
+    name: str   # dist/dir-name, != __init__(name=)
 
     def assemble(self):
         ret = super().assemble()
 
-        new_name = str(Path(self.name).with_name(app_name_version))
-        with zipfile.ZipFile(new_name + '.zip', 'w', zipfile.ZIP_DEFLATED) as z:
-            z.write(self.name)
+        # No file extension. (make_archive() adds extension)
+        zip_name = str(Path(self.name).with_name(app_name_version))
+        shutil.make_archive(zip_name, 'zip', self.name)
+        assert os.path.getsize(zip_name + '.zip') > 2**20
 
         return ret