diff --git a/src/libstore/filetransfer.cc b/src/libstore/filetransfer.cc
index ffbc55b3087..19939aae8b1 100644
--- a/src/libstore/filetransfer.cc
+++ b/src/libstore/filetransfer.cc
@@ -419,10 +419,12 @@ struct curlFileTransfer : public FileTransfer
         }
 
         static int resolverCallbackWrapper(void *, void *, void * clientp) noexcept
-        {
+        try {
             // Create the `Activity` associated with this download.
             ((TransferItem *) clientp)->act();
             return 0;
+        } catch (...) {
+            return 1;
         }
 
         void unpause()