diff --git a/src/http/ngx_http_cache.h b/src/http/ngx_http_cache.h
index f10dc99..f9bf661 100644
--- a/src/http/ngx_http_cache.h
+++ b/src/http/ngx_http_cache.h
@@ -4,6 +4,7 @@
 
 #include <ngx_config.h>
 #include <ngx_core.h>
+#include <ngx_http.h>
 
 
 typedef struct {