diff --git a/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h b/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h
--- a/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/RPCUtils.h
@@ -1417,7 +1417,7 @@
     auto FutureResult = Promise.get_future();
 
     if (auto Err = this->template appendCallAsync<Func>(
-            [Promise = std::move(Promise)](ErrorReturn RetOrErr) {
+            [Promise = std::move(Promise)](ErrorReturn RetOrErr) mutable {
               Promise.set_value(std::move(RetOrErr));
               return Error::success();
             },