diff --git a/interfaces/python_sdist/pyproject.toml.in b/interfaces/python_sdist/pyproject.toml.in
index 2deb36e0cb..0d7be6fe8d 100644
--- a/interfaces/python_sdist/pyproject.toml.in
+++ b/interfaces/python_sdist/pyproject.toml.in
@@ -93,7 +93,7 @@ test-command = "pytest -vv --durations=100 ${CANTERA_TEST_DIR}/test/python"
 
 [tool.cibuildwheel.windows]
 before-build = "pip install delvewheel"
-repair-wheel-command = "delvewheel repair --add-path %HDF5_LIB_DIR% -w {dest_dir} {wheel}"
+repair-wheel-command = "delvewheel repair --add-path %HDF5_LIB_DIR%;%ZLIB_LIB_DIR% -w {dest_dir} {wheel}"
 test-command = "pytest -vv --durations=100 %CANTERA_TEST_DIR%\\test\\python"
 
 [tool.cibuildwheel.macos]