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-rw-r--r--include/mbgl/style/expression/collator.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mbgl/style/expression/collator.hpp b/include/mbgl/style/expression/collator.hpp
index 51ba426fad..95a072618a 100644
--- a/include/mbgl/style/expression/collator.hpp
+++ b/include/mbgl/style/expression/collator.hpp
@@ -11,7 +11,7 @@ namespace expression {
class Collator {
public:
- Collator(bool caseSensitive, bool diacriticSensitive, optional<std::string> locale = {});
+ Collator(bool caseSensitive, bool diacriticSensitive, const optional<std::string>& locale = {});
bool operator==(const Collator& other) const;