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-rw-r--r--src/libstore/remote-store.cc3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 93319ebb8e49..8f162daeee42 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();
 }