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-rw-r--r--third_party/nix/src/libutil/archive.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libutil/archive.hh b/third_party/nix/src/libutil/archive.hh
index 07f58b5f9433..194d31d078c4 100644
--- a/third_party/nix/src/libutil/archive.hh
+++ b/third_party/nix/src/libutil/archive.hh
@@ -62,7 +62,7 @@ struct ParseSink {
 struct TeeSink : ParseSink {
   TeeSource source;
 
-  TeeSink(Source& source) : source(source) {}
+  explicit TeeSink(Source& source) : source(source) {}
 };
 
 void parseDump(ParseSink& sink, Source& source);