1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 9db90c872a4b..3d8b2a0c4263 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -198,6 +198,9 @@ void RemoteStore::setOptions()
         writeInt(logType, to);
         writeInt(printBuildTrace, to);
     }
+    if (GET_PROTOCOL_MINOR(daemonVersion) >= 6) {
+        writeInt(buildCores, to);
+    }
     processStderr();
 }