diff --git a/lix/legacy/nix-store.cc b/lix/legacy/nix-store.cc
index f3e5c1b25..5d80b7c65 100644
--- a/lix/legacy/nix-store.cc
+++ b/lix/legacy/nix-store.cc
@@ -534,11 +534,14 @@ static void opDumpDB(AsyncIoRoot & aio, Strings opFlags, Strings opArgs)
 {
     if (!opFlags.empty()) throw UsageError("unknown flag");
     if (!opArgs.empty()) {
-        for (auto & i : opArgs)
-            cout << store->makeValidityRegistration({store->followLinksToStorePath(i)}, true, true);
+        for (auto & i : opArgs) {
+            cout << aio.blockOn(
+                store->makeValidityRegistration({store->followLinksToStorePath(i)}, true, true)
+            );
+        }
     } else {
         for (auto & i : store->queryAllValidPaths())
-            cout << store->makeValidityRegistration({i}, true, true);
+            cout << aio.blockOn(store->makeValidityRegistration({i}, true, true));
     }
 }
 
diff --git a/lix/libstore/build/local-derivation-goal.cc b/lix/libstore/build/local-derivation-goal.cc
index 803c1b5cf..a9a4437b7 100644
--- a/lix/libstore/build/local-derivation-goal.cc
+++ b/lix/libstore/build/local-derivation-goal.cc
@@ -574,9 +574,9 @@ try {
             /* Write closure info to <fileName>. */
             writeFile(
                 tmpDir + "/" + fileName,
-                worker.store.makeValidityRegistration(
+                TRY_AWAIT(worker.store.makeValidityRegistration(
                     TRY_AWAIT(worker.store.exportReferences({storePath}, inputPaths)), false, false
-                )
+                ))
             );
         }
     }
diff --git a/lix/libstore/store-api.cc b/lix/libstore/store-api.cc
index cc29985b8..082700a39 100644
--- a/lix/libstore/store-api.cc
+++ b/lix/libstore/store-api.cc
@@ -909,9 +909,9 @@ try {
 /* Return a string accepted by decodeValidPathInfo() that
    registers the specified paths as valid.  Note: it's the
    responsibility of the caller to provide a closure. */
-std::string Store::makeValidityRegistration(const StorePathSet & paths,
+kj::Promise<Result<std::string>> Store::makeValidityRegistration(const StorePathSet & paths,
     bool showDerivers, bool showHash)
-{
+try {
     std::string s = "";
 
     for (auto & i : paths) {
@@ -933,7 +933,9 @@ std::string Store::makeValidityRegistration(const StorePathSet & paths,
             s += printStorePath(j) + "\n";
     }
 
-    return s;
+    co_return s;
+} catch (...) {
+    co_return result::current_exception();
 }
 
 
diff --git a/lix/libstore/store-api.hh b/lix/libstore/store-api.hh
index 6ef474e30..be0a48c19 100644
--- a/lix/libstore/store-api.hh
+++ b/lix/libstore/store-api.hh
@@ -682,7 +682,7 @@ public:
      * can be loaded into the database using `nix-store --load-db` or
      * `nix-store --register-validity`.
      */
-    std::string makeValidityRegistration(const StorePathSet & paths,
+    kj::Promise<Result<std::string>> makeValidityRegistration(const StorePathSet & paths,
         bool showDerivers, bool showHash);
 
     /**