diff --git a/apache2/modsecurity.h b/apache2/modsecurity.h
index f4779046..f92c78a7 100644
--- a/apache2/modsecurity.h
+++ b/apache2/modsecurity.h
@@ -304,6 +304,9 @@ struct modsec_rec {
     /* other */
     apr_table_t         *collections;
     apr_table_t         *collections_dirty;
+
+    /* rule processing temp pool */
+    apr_pool_t          *msc_rule_mptmp;
 };
 
 struct directory_config {