diff --git a/src/libstore/unix/build/external-derivation-builder.cc b/src/libstore/unix/build/external-derivation-builder.cc
index 0f32392a5..8efdf8ff9 100644
--- a/src/libstore/unix/build/external-derivation-builder.cc
+++ b/src/libstore/unix/build/external-derivation-builder.cc
@@ -21,7 +21,7 @@ struct ExternalDerivationBuilder : DerivationBuilderImpl
             for (auto & system : handler.systems)
                 if (params.drv.platform == system)
                     return std::make_unique<ExternalDerivationBuilder>(
-                        store, std::move(miscMethods), std::move(params), std::move(handler));
+                        store, std::move(miscMethods), std::move(params), handler);
         }
         return {};
     }