diff --git a/completions/zsh/_foot b/completions/zsh/_foot
index c68f1716..bd74e118 100644
--- a/completions/zsh/_foot
+++ b/completions/zsh/_foot
@@ -5,7 +5,7 @@ _arguments \
     '(-c --config)'{-c,--config}'[path to configuration file (XDG_CONFIG_HOME/footrc)]:config:_files' \
     '(-f --font)'{-f,--font}'[font name and style in fontconfig format (monospace)]:font:->fonts' \
     '(-t --term)'{-t,--term}'[value to set the environment variable TERM to (foot)]:term:->terms' \
-    '(-g --geometry)'{-g,--geometry}'[window WIDTHxHEIGHT, in pixels (80x24 cells)]' \
+    '(-g --geometry)'{-g,--geometry}'[window WIDTHxHEIGHT, in pixels (80x24 cells)]:geometry:()' \
     '(-s --server)'{-s,--server}'[run as server; open terminals by running footclient]:server:_files' \
     '(-v --version)'{-v,--version}'[show the version number and quit]' \
     '(-h --help)'{-h,--help}'[show help message and quit]'