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-rw-r--r--src/nix/hash.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nix/hash.cc b/src/nix/hash.cc
index 9c06e6116..53a9fd204 100644
--- a/src/nix/hash.cc
+++ b/src/nix/hash.cc
@@ -15,7 +15,7 @@ struct CmdHash : Command
bool truncate = false;
HashType ht = htSHA256;
std::vector<std::string> paths;
- std::experimental::optional<std::string> modulus;
+ std::optional<std::string> modulus;
CmdHash(Mode mode) : mode(mode)
{