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-rw-r--r--src/libstore/remote-store.cc5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 080cef93d214..d5303755855c 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -411,8 +411,9 @@ void RemoteStore::addToStore(const ValidPathInfo & info, Source & source,
                  << info.references << info.registrationTime << info.narSize
                  << info.ultimate << info.sigs << info.ca
                  << repair << !checkSigs;
-        copyNAR(source, conn->to);
-        conn->processStderr();
+        bool tunnel = GET_PROTOCOL_MINOR(conn->daemonVersion) >= 21;
+        if (!tunnel) copyNAR(source, conn->to);
+        conn->processStderr(0, tunnel ? &source : nullptr);
     }
 }