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-rw-r--r--src/support/insert_ordered.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/support/insert_ordered.h b/src/support/insert_ordered.h
index 12c98a3b2..6b0f54968 100644
--- a/src/support/insert_ordered.h
+++ b/src/support/insert_ordered.h
@@ -96,7 +96,7 @@ template<typename Key, typename T> struct InsertOrderedMap {
const_iterator begin() const { return List.begin(); }
const_iterator end() const { return List.end(); }
- std::pair<iterator, bool> insert(std::pair<const Key, T>& kv) {
+ std::pair<iterator, bool> insert(const std::pair<const Key, T>& kv) {
// Try inserting with a placeholder list iterator.
auto inserted = Map.insert({kv.first, List.end()});
if (inserted.second) {