diff --git a/src/libstore/filetransfer.cc b/src/libstore/filetransfer.cc
index 5a606b207..b68c636fa 100644
--- a/src/libstore/filetransfer.cc
+++ b/src/libstore/filetransfer.cc
@@ -663,10 +663,9 @@ struct curlFileTransfer : public FileTransfer
         return enqueueFileTransfer(uri, headers, std::nullopt, false);
     }
 
-    std::future<FileTransferResult>
-    enqueueUpload(const std::string & uri, std::string data, const Headers & headers) override
+    void upload(const std::string & uri, std::string data, const Headers & headers) override
     {
-        return enqueueFileTransfer(uri, headers, std::move(data), false);
+        enqueueFileTransfer(uri, headers, std::move(data), false).get();
     }
 
     std::future<FileTransferResult> enqueueFileTransfer(
diff --git a/src/libstore/filetransfer.hh b/src/libstore/filetransfer.hh
index b885c59d5..2900fdee5 100644
--- a/src/libstore/filetransfer.hh
+++ b/src/libstore/filetransfer.hh
@@ -80,8 +80,8 @@ struct FileTransfer
     /**
      * Upload some data. May throw a FileTransferError exception.
      */
-    virtual std::future<FileTransferResult>
-    enqueueUpload(const std::string & uri, std::string data, const Headers & headers = {}) = 0;
+    virtual void
+    upload(const std::string & uri, std::string data, const Headers & headers = {}) = 0;
 
     /**
      * Checks whether the given URI exists. For historical reasons this function
diff --git a/src/libstore/http-binary-cache-store.cc b/src/libstore/http-binary-cache-store.cc
index c7bfb8e0c..4afec752f 100644
--- a/src/libstore/http-binary-cache-store.cc
+++ b/src/libstore/http-binary-cache-store.cc
@@ -127,9 +127,7 @@ protected:
     {
         auto data = StreamToSourceAdapter(istream).drain();
         try {
-            getFileTransfer()
-                ->enqueueUpload(makeURI(path), std::move(data), {{"Content-Type", mimeType}})
-                .get();
+            getFileTransfer()->upload(makeURI(path), std::move(data), {{"Content-Type", mimeType}});
         } catch (FileTransferError & e) {
             throw UploadToHTTP(
                 "while uploading to HTTP binary cache at '%s': %s", cacheUri, e.msg()