diff --git a/src/engine/engine.cc b/src/engine/engine.cc
index 36bc323..e0b9708 100644
--- a/src/engine/engine.cc
+++ b/src/engine/engine.cc
@@ -112,7 +112,7 @@ void Engine::operator()(TradeOrder const& trade_order) {
             bid_map_it != bids_.end()) {
             auto& [_, bid_map] = *bid_map_it;
             if (bid_map.size() > 0
-                && bid_map.begin()->first <= trade_order.price) {
+                && bid_map.begin()->first >= trade_order.price) {
                 // FIXME: handle matching if enabled
                 listener_->on_rejection(trade_order.user, trade_order.id);
                 return;
@@ -127,7 +127,7 @@ void Engine::operator()(TradeOrder const& trade_order) {
             ask_map_it != asks_.end()) {
             auto& [_, ask_map] = *ask_map_it;
             if (ask_map.size() > 0
-                && ask_map.begin()->first >= trade_order.price) {
+                && ask_map.begin()->first <= trade_order.price) {
                 // FIXME: handle matching if enabled
                 listener_->on_rejection(trade_order.user, trade_order.id);
                 return;
diff --git a/src/engine/engine.hh b/src/engine/engine.hh
index 6c84a63..f539b36 100644
--- a/src/engine/engine.hh
+++ b/src/engine/engine.hh
@@ -39,8 +39,8 @@ private:
     template <typename Order>
     using instrument_side_data = std::multimap<Price, OrderMetaData, Order>;
 
-    std::map<Symbol, instrument_side_data<std::less<void>>> bids_;
-    std::map<Symbol, instrument_side_data<std::greater<void>>> asks_;
+    std::map<Symbol, instrument_side_data<std::greater<void>>> bids_;
+    std::map<Symbol, instrument_side_data<std::less<void>>> asks_;
 };
 
 } // namespace kraken::engine