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-rw-r--r--src/mbgl/map/map.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mbgl/map/map.cpp b/src/mbgl/map/map.cpp
index 565d39c515..26795f7814 100644
--- a/src/mbgl/map/map.cpp
+++ b/src/mbgl/map/map.cpp
@@ -111,7 +111,7 @@ Map::Map(Backend& backend,
GLContextMode contextMode,
ConstrainMode constrainMode,
ViewportMode viewportMode,
- const optional<std::string>& programCacheDir)
+ optional<std::string> programCacheDir)
: impl(std::make_unique<Impl>(*this,
backend,
pixelRatio,