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-rw-r--r--src/nix-instantiate/nix-instantiate.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nix-instantiate/nix-instantiate.cc b/src/nix-instantiate/nix-instantiate.cc
index b6845197ec71..13a145a3b53e 100644
--- a/src/nix-instantiate/nix-instantiate.cc
+++ b/src/nix-instantiate/nix-instantiate.cc
@@ -79,7 +79,7 @@ void processExpr(EvalState & state, const Strings & attrPaths,
                     printGCWarning();
                 else {
                     Path rootName = gcRoot;
-                    if (++rootNr > 1) rootName += "-" + int2String(rootNr);
+                    if (++rootNr > 1) rootName += "-" + std::to_string(rootNr);
                     drvPath = addPermRoot(*store, drvPath, rootName, indirectRoot);
                 }
                 std::cout << format("%1%%2%\n") % drvPath % (outputName != "out" ? "!" + outputName : "");