diff --git a/src/nxt_application.h b/src/nxt_application.h
index b5ce3e63..1fca5dff 100644
--- a/src/nxt_application.h
+++ b/src/nxt_application.h
@@ -88,12 +88,6 @@ struct nxt_common_app_conf_s {
 };
 
 
-typedef struct {
-    nxt_str_t                  name;
-    nxt_str_t                  value;
-} nxt_app_header_field_t;
-
-
 typedef struct {
     nxt_str_t                  method;
     nxt_str_t                  target;