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-rw-r--r--src/mbgl/util/tile_cover.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mbgl/util/tile_cover.cpp b/src/mbgl/util/tile_cover.cpp
index 11d5e57d7f..106ad9aa57 100644
--- a/src/mbgl/util/tile_cover.cpp
+++ b/src/mbgl/util/tile_cover.cpp
@@ -34,7 +34,7 @@ struct edge {
};
// scan-line conversion
-static void scanSpans(edge e0, edge e1, int32_t ymin, int32_t ymax, ScanLine scanLine) {
+static void scanSpans(edge e0, edge e1, int32_t ymin, int32_t ymax, ScanLine& scanLine) {
double y0 = ::fmax(ymin, std::floor(e1.y0));
double y1 = ::fmin(ymax, std::ceil(e1.y1));