diff --git a/tests/validation/reference/ConvertFullyConnectedWeights.cpp b/tests/validation/reference/ConvertFullyConnectedWeights.cpp
index b0f537f..e27846c 100644
--- a/tests/validation/reference/ConvertFullyConnectedWeights.cpp
+++ b/tests/validation/reference/ConvertFullyConnectedWeights.cpp
@@ -36,9 +36,15 @@
 {
     SimpleTensor<T> dst(src.shape(), src.data_type());
 
+    const DataLayout original_input_data_layout = (training_data_layout == DataLayout::NCHW) ? DataLayout::NHWC : DataLayout::NCHW;
+
+    const int width_idx   = get_data_layout_dimension_index(original_input_data_layout, DataLayoutDimension::WIDTH);
+    const int height_idx  = get_data_layout_dimension_index(original_input_data_layout, DataLayoutDimension::HEIGHT);
+    const int channel_idx = get_data_layout_dimension_index(original_input_data_layout, DataLayoutDimension::CHANNEL);
+
     const bool         is_nchw_to_nhwc           = training_data_layout == DataLayout::NCHW;
-    const unsigned int num_elems_per_input_plane = original_input_shape.x() * original_input_shape.y();
-    const unsigned int num_channels              = original_input_shape.z();
+    const unsigned int num_elems_per_input_plane = original_input_shape[width_idx] * original_input_shape[height_idx];
+    const unsigned int num_channels              = original_input_shape[channel_idx];
     const unsigned int factor_1                  = is_nchw_to_nhwc ? num_elems_per_input_plane : num_channels;
     const unsigned int factor_2                  = is_nchw_to_nhwc ? num_channels : num_elems_per_input_plane;