diff --git a/src/Magnum/Test/MeshGLTest.cpp b/src/Magnum/Test/MeshGLTest.cpp
index 145ff0fdf..d27fda6ea 100644
--- a/src/Magnum/Test/MeshGLTest.cpp
+++ b/src/Magnum/Test/MeshGLTest.cpp
@@ -904,7 +904,7 @@ void MeshGLTest::addVertexBufferMatrixNxNd() {
                 DynamicAttribute::Kind::Long, 1,
                 DynamicAttribute::Components::Three,
                 DynamicAttribute::DataType::Double})
-            .addVertexBuffer(buffer, 3*3*8 + 6*4, 3*3*8, DynamicAttribute{
+            .addVertexBuffer(buffer, 3*3*8 + 6*8, 3*3*8, DynamicAttribute{
                 DynamicAttribute::Kind::Long, 2,
                 DynamicAttribute::Components::Three,
                 DynamicAttribute::DataType::Double});