diff --git a/irr/src/CGLTFMeshFileLoader.cpp b/irr/src/CGLTFMeshFileLoader.cpp
index 03c871e32..31f56038f 100644
--- a/irr/src/CGLTFMeshFileLoader.cpp
+++ b/irr/src/CGLTFMeshFileLoader.cpp
@@ -181,13 +181,13 @@ void CGLTFMeshFileLoader::MeshExtractor::loadMesh(
 
 // Base transformation between left & right handed coordinate systems.
 // This just inverts the Z axis.
-static core::matrix4 leftToRight = core::matrix4(
+static const core::matrix4 leftToRight = core::matrix4(
 	1, 0, 0, 0,
 	0, 1, 0, 0,
 	0, 0, -1, 0,
 	0, 0, 0, 1
 );
-static core::matrix4 rightToLeft = leftToRight;
+static const core::matrix4 rightToLeft = leftToRight;
 
 static core::matrix4 loadTransform(const tiniergltf::Node::Matrix &m)
 {