diff --git a/gen_pc_sidecar.php b/gen_pc_sidecar.php
index b0f0762..2eceb7d 100755
--- a/gen_pc_sidecar.php
+++ b/gen_pc_sidecar.php
@@ -128,7 +128,7 @@ function whitelist_extension_filter(array &$pbdb) {
   }));
 }
 
-function blacklist_extension_filter(array &$pbdb): null {
+function blacklist_extension_filter(array &$pbdb) {
   global $EXTENSION_FILTER_LIST;
 
   $blocked = array_fill_keys(