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-rw-r--r--src/mbgl/util/mat4.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mbgl/util/mat4.hpp b/src/mbgl/util/mat4.hpp
index 2adeba8821..438771949f 100644
--- a/src/mbgl/util/mat4.hpp
+++ b/src/mbgl/util/mat4.hpp
@@ -32,7 +32,7 @@ using mat4 = std::array<double, 16>;
namespace matrix {
void identity(mat4& out);
-bool invert(mat4& out, mat4& a);
+bool invert(mat4& out, const mat4& a);
void ortho(mat4& out, double left, double right, double bottom, double top, double near, double far);
void perspective(mat4& out, double fovy, double aspect, double near, double far);
void copy(mat4& out, const mat4& a);