diff --git a/modules/lua/mod_lua.h b/modules/lua/mod_lua.h
index 46395da784..33807fbdb5 100644
--- a/modules/lua/mod_lua.h
+++ b/modules/lua/mod_lua.h
@@ -26,6 +26,7 @@
 #include "http_request.h"
 #include "http_log.h"
 #include "http_protocol.h"
+#include "http_ssl.h"
 #include "ap_regex.h"
 
 #include "ap_config.h"