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-rw-r--r--src/libstore/optimise-store.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/optimise-store.cc b/src/libstore/optimise-store.cc
index 891540ae4c1d..7840167d7772 100644
--- a/src/libstore/optimise-store.cc
+++ b/src/libstore/optimise-store.cc
@@ -213,7 +213,7 @@ void LocalStore::optimisePath_(Activity * act, OptimiseStats & stats,
     MakeReadOnly makeReadOnly(mustToggle ? dirOf(path) : "");
 
     Path tempLink = (format("%1%/.tmp-link-%2%-%3%")
-        % realStoreDir % getpid() % rand()).str();
+        % realStoreDir % getpid() % random()).str();
 
     if (link(linkPath.c_str(), tempLink.c_str()) == -1) {
         if (errno == EMLINK) {