diff --git a/pdns/dnsdist-lua-bindings.cc b/pdns/dnsdist-lua-bindings.cc
index e25d74abe8c3..34a745bb6013 100644
--- a/pdns/dnsdist-lua-bindings.cc
+++ b/pdns/dnsdist-lua-bindings.cc
@@ -107,14 +107,14 @@ void setupLuaBindings(LuaContext& luaCtx, bool client, bool configCheck)
 
 #ifndef DISABLE_DOWNSTREAM_BINDINGS
   /* DownstreamState */
-  luaCtx.registerFunction<void(DownstreamState::*)(int)>("setQPS", [](DownstreamState& state, int lim) { state.qps = lim ? QPSLimiter(lim, lim) : QPSLimiter(); });
-  luaCtx.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("addPool", [](std::shared_ptr<DownstreamState> state, string pool) {
+  luaCtx.registerFunction<void(DownstreamState::*)(int)>("setQPS", [](DownstreamState& state, int lim) { state.qps = lim > 0 ? QPSLimiter(lim, lim) : QPSLimiter(); });
+  luaCtx.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("addPool", [](const std::shared_ptr<DownstreamState>& state, string pool) {
       auto localPools = g_pools.getCopy();
       addServerToPool(localPools, pool, state);
       g_pools.setState(localPools);
       state->d_config.pools.insert(pool);
     });
-  luaCtx.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("rmPool", [](std::shared_ptr<DownstreamState> state, string pool) {
+  luaCtx.registerFunction<void(std::shared_ptr<DownstreamState>::*)(string)>("rmPool", [](const std::shared_ptr<DownstreamState>& state, string pool) {
       auto localPools = g_pools.getCopy();
       removeServerFromPool(localPools, pool, state);
       g_pools.setState(localPools);