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-rw-r--r--third_party/nix/src/libstore/export-import.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libstore/export-import.cc b/third_party/nix/src/libstore/export-import.cc
index 6a1862492d1f..d50638d5b0f7 100644
--- a/third_party/nix/src/libstore/export-import.cc
+++ b/third_party/nix/src/libstore/export-import.cc
@@ -9,7 +9,7 @@ namespace nix {
 struct HashAndWriteSink : Sink {
   Sink& writeSink;
   HashSink hashSink;
-  HashAndWriteSink(Sink& writeSink)
+  explicit HashAndWriteSink(Sink& writeSink)
       : writeSink(writeSink), hashSink(htSHA256) {}
   virtual void operator()(const unsigned char* data, size_t len) {
     writeSink(data, len);