diff --git a/writer/HDF5DataFilePluginMX.cpp b/writer/HDF5DataFilePluginMX.cpp
index 150c9147..b5e403fd 100644
--- a/writer/HDF5DataFilePluginMX.cpp
+++ b/writer/HDF5DataFilePluginMX.cpp
@@ -204,7 +204,7 @@ void HDF5DataFilePluginMX::WriteFinal(HDF5File &data_file) {
     if (!profile_radius.empty())
         data_file.SaveVector("/entry/MX/profileRadius", profile_radius.vec())->Units("Angstrom^-1");
     if (!mosaicity_deg.empty())
-        data_file.SaveVector("/entry/MX/mosaicity", profile_radius.vec())->Units("deg");
+        data_file.SaveVector("/entry/MX/mosaicity", mosaicity_deg.vec())->Units("deg");
     if (!b_factor.empty())
         data_file.SaveVector("/entry/MX/bFactor", b_factor.vec())->Units("Angstrom^2");