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-rw-r--r--src/mbgl/programs/line_program.hpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mbgl/programs/line_program.hpp b/src/mbgl/programs/line_program.hpp
index 95b9362b85..da9964e623 100644
--- a/src/mbgl/programs/line_program.hpp
+++ b/src/mbgl/programs/line_program.hpp
@@ -59,7 +59,8 @@ public:
{{
p.x,
p.y,
- static_cast<int16_t>(attributes::packUint8Pair(round ? 1 : 0, up ? 1 : 0))
+ static_cast<int16_t>(round ? 1 : 0),
+ static_cast<int16_t>(up ? 1 : -1)
}},
{{
// add 128 to store a byte in an unsigned byte