diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index 9b775e16a..bc63955af 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -519,6 +519,8 @@ void LocalStore::checkDerivationOutputs(const Path & drvPath, const Derivation &
 uint64_t LocalStore::addValidPath(State & state,
     const ValidPathInfo & info, bool checkOutputs)
 {
+    assert(info.ca == "" || info.isContentAddressed(*this));
+
     state.stmtRegisterValidPath.use()
         (info.path)
         ("sha256:" + printHash(info.narHash))