diff --git a/contrib/modsecurity/modsec_wrapper.c b/contrib/modsecurity/modsec_wrapper.c
index 1daaddbd5..370682bcf 100644
--- a/contrib/modsecurity/modsec_wrapper.c
+++ b/contrib/modsecurity/modsec_wrapper.c
@@ -325,7 +325,11 @@ int modsecurity_process(struct worker *worker, struct modsecurity_parameters *pa
 	req->content_type = apr_table_get(req->headers_in, "Content-Type");
 	req->content_encoding = apr_table_get(req->headers_in, "Content-Encoding");
 	req->hostname = apr_table_get(req->headers_in, "Host");
-	req->parsed_uri.hostname = chunk_strdup(req, req->hostname, strlen(req->hostname));
+	if (req->hostname != NULL) {
+		req->parsed_uri.hostname = chunk_strdup(req, req->hostname, strlen(req->hostname));
+	} else {
+		req->parsed_uri.hostname = NULL;
+	}
 
 	lang = apr_table_get(req->headers_in, "Content-Languages");
 	if (lang != NULL) {