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-rw-r--r--src/libstore/build.cc4
-rw-r--r--src/libstore/download.cc2
2 files changed, 3 insertions, 3 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 93bb2144425f..d6671f45b231 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1732,7 +1732,7 @@ void DerivationGoal::startBuilder()
         if (passAsFile.find(i.first) == passAsFile.end()) {
             env[i.first] = i.second;
         } else {
-            Path p = tmpDir + "/.attr-" + int2String(fileNr++);
+            Path p = tmpDir + "/.attr-" + std::to_string(fileNr++);
             writeFile(p, i.second);
             filesToChown.insert(p);
             env[i.first + "Path"] = p;
@@ -2142,7 +2142,7 @@ void DerivationGoal::startBuilder()
                    CLONE_PARENT are not allowed together. */
                 child = clone(childEntry, stack + stackSize, flags & ~CLONE_NEWPID, this);
             if (child == -1) throw SysError("cloning builder process");
-            writeFull(builderOut.writeSide, int2String(child) + "\n");
+            writeFull(builderOut.writeSide, std::to_string(child) + "\n");
             _exit(0);
         }, options);
         if (helper.wait(true) != 0)
diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index 94c13249d494..822e9a8db867 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -240,7 +240,7 @@ Path downloadFileCached(const string & url, bool unpack)
             assert(!storePath.empty());
             replaceSymlink(storePath, fileLink);
 
-            writeFile(dataFile, url + "\n" + res.etag + "\n" + int2String(time(0)) + "\n");
+            writeFile(dataFile, url + "\n" + res.etag + "\n" + std::to_string(time(0)) + "\n");
         } catch (DownloadError & e) {
             if (storePath.empty()) throw;
             printMsg(lvlError, format("warning: %1%; using cached result") % e.msg());