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-rw-r--r--third_party/nix/src/libutil/hash.cc5
1 files changed, 4 insertions, 1 deletions
diff --git a/third_party/nix/src/libutil/hash.cc b/third_party/nix/src/libutil/hash.cc
index e9901d0ccb94..4c6eef0e6d9b 100644
--- a/third_party/nix/src/libutil/hash.cc
+++ b/third_party/nix/src/libutil/hash.cc
@@ -361,7 +361,10 @@ Hash hashFile(HashType ht, const Path& path) {
   return hash;
 }
 
-HashSink::HashSink(HashType ht) : ht(ht), ctx(), bytes(0) { start(ht, *ctx); }
+HashSink::HashSink(HashType ht)
+    : ht(ht), ctx(std::make_unique<hash::Ctx>()), bytes(0) {
+  start(ht, *ctx);
+}
 
 HashSink::~HashSink() { bufPos = 0; }