diff --git a/data/meson.build b/data/meson.build
index d90230e..1f4e809 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -53,7 +53,7 @@ install_data(
 if json_glib_validate.found()
   jsons = []
   foreach theme : theme_json
-    jsons += (join_paths(meson.current_source_dir(), theme_json))
+    jsons += (join_paths(meson.current_source_dir(), theme))
   endforeach
   custom_target('validate-json',
 		build_by_default: true,