diff --git a/src/hydra-queue-runner/build-remote.cc b/src/hydra-queue-runner/build-remote.cc
index d5d2a05b..55958b6c 100644
--- a/src/hydra-queue-runner/build-remote.cc
+++ b/src/hydra-queue-runner/build-remote.cc
@@ -266,7 +266,7 @@ void State::buildRemote(ref<Store> destStore,
             to << cmdBuildDerivation << step->drvPath << basicDrv;
         to << maxSilentTime << buildTimeout;
         if (GET_PROTOCOL_MINOR(remoteVersion) >= 2)
-            to << 64 * 1024 * 1024; // == maxLogSize
+            to << maxLogSize;
         if (GET_PROTOCOL_MINOR(remoteVersion) >= 3) {
             to << repeats // == build-repeat
                << step->isDeterministic; // == enforce-determinism
diff --git a/src/hydra-queue-runner/hydra-queue-runner.cc b/src/hydra-queue-runner/hydra-queue-runner.cc
index 4206b744..9c56beda 100644
--- a/src/hydra-queue-runner/hydra-queue-runner.cc
+++ b/src/hydra-queue-runner/hydra-queue-runner.cc
@@ -85,6 +85,7 @@ State::State()
     , dbPool(config->getIntOption("max_db_connections", 128))
     , memoryTokens(config->getIntOption("nar_buffer_size", getMemSize() / 2))
     , maxOutputSize(config->getIntOption("max_output_size", 2ULL << 30))
+    , maxLogSize(config->getIntOption("max_log_size", 64ULL << 20))
     , uploadLogsToBinaryCache(config->getBoolOption("upload_logs_to_binary_cache", false))
 {
     debug("using %d bytes for the NAR buffer", memoryTokens.capacity());
diff --git a/src/hydra-queue-runner/state.hh b/src/hydra-queue-runner/state.hh
index 4660ca38..d8dc11f7 100644
--- a/src/hydra-queue-runner/state.hh
+++ b/src/hydra-queue-runner/state.hh
@@ -420,6 +420,7 @@ private:
     nix::TokenServer memoryTokens;
 
     size_t maxOutputSize;
+    size_t maxLogSize;
 
     time_t lastStatusLogged = 0;
     const int statusLogInterval = 300;