diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e1b18fde..295d97cd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -92,5 +92,5 @@ target_compile_options(evm_runtime PUBLIC --no-missing-ricardian-clause)
 if (WITH_LARGE_STACK)
     target_link_options(evm_runtime PUBLIC --stack-size=50000000)
 else()
-    target_link_options(evm_runtime PUBLIC --stack-size=35088)
+    target_link_options(evm_runtime PUBLIC --stack-size=34896)
 endif()
diff --git a/src/config_wrapper.cpp b/src/config_wrapper.cpp
index 58a86ea0..97a9e8f5 100644
--- a/src/config_wrapper.cpp
+++ b/src/config_wrapper.cpp
@@ -80,10 +80,25 @@ void config_wrapper::set_gas_price(uint64_t gas_price) {
 void config_wrapper::enqueue_gas_price(uint64_t gas_price) {
     price_queue_table queue(_self, _self.value);
     auto time = eosio::current_time_point() + eosio::seconds(grace_period_seconds);
+    auto time_us = time.elapsed.count();
+
+    auto it = queue.end();
+    if( it != queue.begin()) {
+        --it;
+        eosio::check(time_us >= it->time, "internal error");
+        if(it->time == time_us) {
+            queue.modify(*it, eosio::same_payer, [&](auto& el) {
+                el.price = gas_price;
+            });
+            return;
+        }
+    }
+
     queue.emplace(_self, [&](auto& el) {
-        el.time = time.elapsed.count();
+        el.time = time_us;
         el.price = gas_price;
     });
+
 }
 
 void config_wrapper::process_price_queue() {
diff --git a/tests/basic_evm_tester.hpp b/tests/basic_evm_tester.hpp
index f6e783f3..91c658bc 100644
--- a/tests/basic_evm_tester.hpp
+++ b/tests/basic_evm_tester.hpp
@@ -1,5 +1,4 @@
 #pragma once
-#include <deque>
 #include <eosio/chain/abi_serializer.hpp>
 #include <eosio/testing/tester.hpp>
 #include <eosio/chain/fixed_bytes.hpp>
diff --git a/tests/gas_fee_tests.cpp b/tests/gas_fee_tests.cpp
index 29c58b9e..5a442db1 100644
--- a/tests/gas_fee_tests.cpp
+++ b/tests/gas_fee_tests.cpp
@@ -334,10 +334,20 @@ try {
 
    produce_blocks(100);
 
-   // Queue change of gas_price to 20Gwei
-   setfeeparams({.gas_price = 2*ten_gwei});
+   // Queue change of gas_price to 30Gwei
+   setfeeparams({.gas_price = 3*ten_gwei});
    auto t2 = control->pending_block_time()+fc::seconds(price_queue_grace_period);
 
+   q = get_price_queue();
+   BOOST_CHECK_EQUAL(q.size(), 2);
+   BOOST_CHECK_EQUAL(q[0].time, t1.time_since_epoch().count());
+   BOOST_CHECK_EQUAL(q[0].price, ten_gwei);
+   BOOST_CHECK_EQUAL(q[1].time, t2.time_since_epoch().count());
+   BOOST_CHECK_EQUAL(q[1].price, 3*ten_gwei);
+
+   // Overwrite queue change (same block) 20Gwei
+   setfeeparams({.gas_price = 2*ten_gwei});
+
    q = get_price_queue();
    BOOST_CHECK_EQUAL(q.size(), 2);
    BOOST_CHECK_EQUAL(q[0].time, t1.time_since_epoch().count());