diff --git a/src/filter.c b/src/filter.c
index a9391dc..0c8d3e5 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -76,6 +76,7 @@ f2b_filter_create(f2b_config_section_t *config, const char *file) {
   int flags = RTLD_NOW | RTLD_LOCAL;
   const char *dlerr = NULL;
 
+  assert(file   != NULL);
   assert(config != NULL);
   assert(config->type == t_filter);
 
@@ -125,6 +126,8 @@ f2b_filter_create(f2b_config_section_t *config, const char *file) {
       config->name, param->name, param->value);
   }
 
+  strlcpy(filter->file, file, sizeof(filter->file));
+
   if (!f2b_filter_load_file(filter, file))
     goto cleanup;
 
diff --git a/src/filter.h b/src/filter.h
index 352bb39..76b3565 100644
--- a/src/filter.h
+++ b/src/filter.h
@@ -13,6 +13,7 @@
 typedef struct f2b_filter_t {
   void *h;
   void *cfg;
+  char file[PATH_MAX];
   void *(*create)  (const char *id);
   bool  (*config)  (void *cfg, const char *key, const char *value);
   bool  (*append)  (void *cfg, const char *pattern);