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-rw-r--r--src/libstore/build/derivation-goal.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/build/derivation-goal.cc b/src/libstore/build/derivation-goal.cc
index 2021d0023..38b73d531 100644
--- a/src/libstore/build/derivation-goal.cc
+++ b/src/libstore/build/derivation-goal.cc
@@ -732,7 +732,7 @@ void replaceValidPath(const Path & storePath, const Path & tmpPath)
tmpPath (the replacement), so we have to move it out of the
way first. We'd better not be interrupted here, because if
we're repairing (say) Glibc, we end up with a broken system. */
- Path oldPath = (format("%1%.old-%2%-%3%") % storePath % getpid() % random()).str();
+ Path oldPath = fmt("%1%.old-%2%-%3%", storePath, getpid(), random());
if (pathExists(storePath))
movePath(storePath, oldPath);