diff --git a/src/http/ngx_http_variables.h b/src/http/ngx_http_variables.h
index f3f1fe8..2043a05 100644
--- a/src/http/ngx_http_variables.h
+++ b/src/http/ngx_http_variables.h
@@ -56,7 +56,7 @@
     ngx_uint_t index);
 
 ngx_http_variable_value_t *ngx_http_get_variable(ngx_http_request_t *r,
-    ngx_str_t *name, ngx_uint_t key);
+    ngx_str_t *name, ngx_uint_t key, ngx_uint_t nowarn);
 
 #define ngx_http_clear_variable(r, index) r->variables0[index].text.data = NULL;