diff --git a/src/completions/meson.build b/src/completions/meson.build
index 10001f1..c37cd87 100644
--- a/src/completions/meson.build
+++ b/src/completions/meson.build
@@ -30,7 +30,7 @@ if zshcomp
       generate_completion,
       'zsh',
     ],
-    install_dir: get_option('zshcomp'),
+    install_dir: get_option('zshcomp') != '' ? get_option('datadir') / 'zsh' / 'site-functions' : get_option('zshcomp'),
     kwargs: completions_common,
   )
 endif