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-rw-r--r--src/nix-instantiate/nix-instantiate.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/nix-instantiate/nix-instantiate.cc b/src/nix-instantiate/nix-instantiate.cc
index 762b52ae1da3..afd16b3a52bb 100644
--- a/src/nix-instantiate/nix-instantiate.cc
+++ b/src/nix-instantiate/nix-instantiate.cc
@@ -139,6 +139,8 @@ void run(Strings args)
             strict = true;
         else if (arg == "--repair")
             state.repair = true;
+        else if (arg == "--dry-run")
+            settings.readOnlyMode = true;
         else if (arg[0] == '-')
             throw UsageError(format("unknown flag `%1%'") % arg);
         else