diff --git a/manifest.scm b/manifest.scm
index 40c6bf4e..35660e30 100644
--- a/manifest.scm
+++ b/manifest.scm
@@ -15,7 +15,7 @@
 ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 (specifications->manifest
- (list "python" "python-platformdirs" "python-lxml"
+ (list "python" "zlib" "python-platformdirs" "python-lxml"
        "python-pyqt@5" "python-pyqt5-sip"
        "python-pyqtgraph" "python-qscintilla"
        "python-numpy" "python-shapely" "python-pyshp"