diff --git a/server/core/filter.c b/server/core/filter.c
index eb226e7f2..a3db72e3b 100644
--- a/server/core/filter.c
+++ b/server/core/filter.c
@@ -60,6 +60,7 @@ FILTER_DEF 	*filter;
 		return NULL;
 	filter->name = strdup(name);
 	filter->module = strdup(module);
+	filter->filter = NULL;
 	filter->options = NULL;
 	filter->obj = NULL;
 	filter->parameters = NULL;