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-rw-r--r--src/libexpr/primops.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 84ef967ffa91..b4e75648f8ab 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1042,7 +1042,7 @@ static void prim_elem(EvalState & state, const Pos & pos, Value * * args, Value
 static void prim_concatLists(EvalState & state, const Pos & pos, Value * * args, Value & v)
 {
     state.forceList(*args[0], pos);
-    state.concatLists(v, args[0]->list.length, args[0]->list.elems);
+    state.concatLists(v, args[0]->list.length, args[0]->list.elems, pos);
 }