diff --git a/nixos/modules/services/web-apps/mediawiki.nix b/nixos/modules/services/web-apps/mediawiki.nix
index 1b8df02f9984..138c997bd945 100644
--- a/nixos/modules/services/web-apps/mediawiki.nix
+++ b/nixos/modules/services/web-apps/mediawiki.nix
@@ -713,7 +713,7 @@ in
           tr -dc A-Za-z0-9 </dev/urandom 2>/dev/null | head -c 64 > ${stateDir}/secret.key
         fi
 
-        echo "exit( wfGetDB( DB_PRIMARY )->tableExists( 'user' ) ? 1 : 0 );" | \
+        echo "exit( \$this->getPrimaryDB()->tableExists( 'user' ) ? 1 : 0 );" | \
         ${php}/bin/php ${pkg}/share/mediawiki/maintenance/eval.php --conf ${mediawikiConfig} && \
         ${php}/bin/php ${pkg}/share/mediawiki/maintenance/install.php \
           --confpath /tmp \