diff --git a/libtbx/auto_build/package_defs.py b/libtbx/auto_build/package_defs.py
index 7194b7f062..12549a9521 100644
--- a/libtbx/auto_build/package_defs.py
+++ b/libtbx/auto_build/package_defs.py
@@ -98,7 +98,7 @@ def get_pypi_package_information(package, version=None, information_only=False):
 PSUTIL_VERSION = "5.5.1"
 
 # HDF5
-BASE_HDF5_PKG_URL = "https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-1.10/hdf5-1.10.5/src/"
+BASE_HDF5_PKG_URL = "https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-1.10/hdf5-1.10.5/src"
 HDF5_PKG = "hdf5-1.10.5.tar.bz2"
 
 # GUI dependencies