diff --git a/auto/options b/auto/options
index 0b21def27..110141dcb 100644
--- a/auto/options
+++ b/auto/options
@@ -134,6 +134,7 @@ STREAM_SSL_PREREAD=NO
 DYNAMIC_MODULES=
 
 NGX_ADDONS=
+NGX_ADDON_SRCS=
 NGX_ADDON_DEPS=
 DYNAMIC_ADDONS=