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-rw-r--r--src/libstore/download.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index 1cb7d4854a98..b228cd0b4b37 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -295,6 +295,7 @@ struct CurlDownloader : public Downloader
     std::thread workerThread;
 
     CurlDownloader()
+        : mt19937(rd())
     {
         static std::once_flag globalInit;
         std::call_once(globalInit, curl_global_init, CURL_GLOBAL_ALL);