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-rw-r--r--src/mbgl/util/mat4.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mbgl/util/mat4.cpp b/src/mbgl/util/mat4.cpp
index 0ad0d371e5..2f7d35a5be 100644
--- a/src/mbgl/util/mat4.cpp
+++ b/src/mbgl/util/mat4.cpp
@@ -47,7 +47,7 @@ void identity(mat4& out) {
out[15] = 1.0f;
}
-bool invert(mat4& out, mat4& a) {
+bool invert(mat4& out, const mat4& a) {
double a00 = a[0], a01 = a[1], a02 = a[2], a03 = a[3],
a10 = a[4], a11 = a[5], a12 = a[6], a13 = a[7],
a20 = a[8], a21 = a[9], a22 = a[10], a23 = a[11],