diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 66e5256422..b896734416 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -183,6 +183,8 @@ void RemoteStore::setOptions()
     writeInt(maxSilentTime, to);
     if (GET_PROTOCOL_MINOR(daemonVersion) >= 2)
         writeInt(useBuildHook, to);
+    if (GET_PROTOCOL_MINOR(daemonVersion) >= 4)
+        writeInt(buildVerbosity, to);
     processStderr();
 }
 
diff --git a/src/libstore/worker-protocol.hh b/src/libstore/worker-protocol.hh
index 63e3f0eb89..a1fa45cf64 100644
--- a/src/libstore/worker-protocol.hh
+++ b/src/libstore/worker-protocol.hh
@@ -8,7 +8,7 @@ namespace nix {
 #define WORKER_MAGIC_1 0x6e697863
 #define WORKER_MAGIC_2 0x6478696f
 
-#define PROTOCOL_VERSION 0x103
+#define PROTOCOL_VERSION 0x104
 #define GET_PROTOCOL_MAJOR(x) ((x) & 0xff00)
 #define GET_PROTOCOL_MINOR(x) ((x) & 0x00ff)
 
diff --git a/src/nix-worker/nix-worker.cc b/src/nix-worker/nix-worker.cc
index 377f2be73a..ddc58c024b 100644
--- a/src/nix-worker/nix-worker.cc
+++ b/src/nix-worker/nix-worker.cc
@@ -426,6 +426,8 @@ static void performOp(unsigned int clientVersion,
         maxSilentTime = readInt(from);
         if (GET_PROTOCOL_MINOR(clientVersion) >= 2)
             useBuildHook = readInt(from) != 0;
+        if (GET_PROTOCOL_MINOR(clientVersion) >= 4)
+            buildVerbosity = (Verbosity) readInt(from);
         startWork();
         stopWork();
         break;