diff --git a/src/ngx_http_lua_kong_module.c b/src/ngx_http_lua_kong_module.c
index df92cfb6..44eee728 100644
--- a/src/ngx_http_lua_kong_module.c
+++ b/src/ngx_http_lua_kong_module.c
@@ -211,7 +211,7 @@ ngx_http_lua_kong_get_next_upstream_mask(ngx_http_request_t *r,
         return upstream_next;
     }
 
-    if(ctx->next_upstream ~= 0) {
+    if(ctx->next_upstream != 0) {
         return ctx->next_upstream;
     }
     return upstream_next;