diff --git a/src/nix-daemon/nix-daemon.cc b/src/nix-daemon/nix-daemon.cc
index 615c1f5dc..423ba15e2 100644
--- a/src/nix-daemon/nix-daemon.cc
+++ b/src/nix-daemon/nix-daemon.cc
@@ -709,7 +709,7 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
         logger->startWork();
 
         // FIXME: race if addToStore doesn't read source?
-        store.cast<Store>()->addToStore(info, *source, (RepairFlag) repair,
+        store->addToStore(info, *source, (RepairFlag) repair,
             dontCheckSigs ? NoCheckSigs : CheckSigs, nullptr);
 
         logger->stopWork();