diff --git a/src/libstore/filetransfer.cc b/src/libstore/filetransfer.cc
index a917188d9..5a298a658 100644
--- a/src/libstore/filetransfer.cc
+++ b/src/libstore/filetransfer.cc
@@ -399,6 +399,8 @@ struct curlFileTransfer : public FileTransfer
         {
             auto finishTime = std::chrono::steady_clock::now();
 
+            auto retryTimeMs = request.baseRetryTimeMs;
+
             auto httpStatus = getHTTPStatus();
 
             debug("finished %s of '%s'; curl status = %d, HTTP status = %d, body = %d bytes, duration = %.2f s",
@@ -449,10 +451,12 @@ struct curlFileTransfer : public FileTransfer
                 } else if (httpStatus == 401 || httpStatus == 403 || httpStatus == 407) {
                     // Don't retry on authentication/authorization failures
                     err = Forbidden;
-                } else if (httpStatus >= 400 && httpStatus < 500 && httpStatus != 408 && httpStatus != 429) {
+                } else if (httpStatus == 429) {
+                    // 429 means too many requests, so we retry (with a substantially longer delay)
+                    retryTimeMs = 60000;
+                } else if (httpStatus >= 400 && httpStatus < 500 && httpStatus != 408) {
                     // Most 4xx errors are client errors and are probably not worth retrying:
                     //   * 408 means the server timed out waiting for us, so we try again
-                    //   * 429 means too many requests, so we retry (with a delay)
                     err = Misc;
                 } else if (httpStatus == 501 || httpStatus == 505 || httpStatus == 511) {
                     // Let's treat most 5xx (server) errors as transient, except for a handful:
@@ -518,7 +522,7 @@ struct curlFileTransfer : public FileTransfer
                         || writtenToSink == 0
                         || (acceptRanges && encoding.empty())))
                 {
-                    int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(fileTransfer.mt19937));
+                    int ms = retryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(fileTransfer.mt19937));
                     if (writtenToSink)
                         warn("%s; retrying from offset %d in %d ms", exc.what(), writtenToSink, ms);
                     else