diff --git a/build.py b/build.py
index 1bf1d30..c953ad1 100755
--- a/build.py
+++ b/build.py
@@ -6,6 +6,7 @@
 import subprocess
 import sys
 from pathlib import Path
+from wheeltools import InWheel
 
 
 root_dir = Path(__file__).parent.resolve()
@@ -37,10 +38,18 @@ def main():
     except (IndexError, KeyError):
         sys.exit("usage: build.py [sdist|wheel]")
 
-    return subprocess.call(
-        cmd + ["-o", str(dist_dir)] + sys.argv[2:], cwd=str(crate_dir)
+    subprocess.run(
+        cmd + ["-o", str(dist_dir)] + sys.argv[2:], check=True, cwd=str(crate_dir)
     )
 
+    # maturin doesn't add the license text to the wheel archive yet so we
+    # have to do it ourselves: cf. https://github.com/PyO3/maturin/issues/829
+    for wheel_file in dist_dir.glob("pngquant*.whl"):
+        with InWheel(in_wheel=str(wheel_file), out_wheel=str(wheel_file)) as tmpdir:
+            distinfo = next(Path(tmpdir).glob("*.dist-info"))
+            assert distinfo.is_dir()
+            shutil.copyfile(crate_dir / "COPYRIGHT", distinfo / "LICENSE")
+
 
 if __name__ == "__main__":
     sys.exit(main())
diff --git a/pyproject.toml b/pyproject.toml
index e3d4014..067802a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,6 @@ name = "pngquant-cli"
 version = "2.17.0.post3"
 description = "Precompiled binaries for pngquant, the lossy PNG compressor based on libimagequant."
 maintainers = [{name = "Cosimo Lupo", email = "cosimo@anthrotype.com"}]
-license = {file = "COPYRIGHT"}
 
 [project.urls]
 repository = "https://github.com/anthrotype/pngquant-wheels"
diff --git a/requirements.txt b/requirements.txt
index a9ee414..9b77ee3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ maturin
 tomli
 tomli-w
 twine
+wheeltools