diff --git a/writer/HDF5NXmx.cpp b/writer/HDF5NXmx.cpp
index 3c99acbb..36e0eb56 100644
--- a/writer/HDF5NXmx.cpp
+++ b/writer/HDF5NXmx.cpp
@@ -193,7 +193,7 @@ void HDF5Metadata::DetectorModule(HDF5File *hdf5_file, const std::string &name,
 }
 
 void HDF5Metadata::SaveCBORImage(HDF5File *hdf5_file, const std::string &hdf5_path, const CBORImage &image) {
-    std::vector<hsize_t> dims = {image.xpixel, image.ypixel};
+    std::vector<hsize_t> dims = {image.ypixel, image.xpixel};
 
     HDF5DataType data_type(image.pixel_depth_bytes, image.pixel_is_signed);
     HDF5Dcpl dcpl;