diff --git a/auto/modules b/auto/modules
index 9880b99..9ac1ddd 100644
--- a/auto/modules
+++ b/auto/modules
@@ -322,6 +322,7 @@
 fi
 
 if [ $HTTP_DEGRADATION = YES ]; then
+    have=NGX_HTTP_DEGRADATION . auto/have
     HTTP_MODULES="$HTTP_MODULES $HTTP_DEGRADATION_MODULE"
     HTTP_SRCS="$HTTP_SRCS $HTTP_DEGRADATION_SRCS"
 fi