diff --git a/Code/Mantid/Framework/MDEvents/src/BoxControllerNeXusIO.cpp b/Code/Mantid/Framework/MDEvents/src/BoxControllerNeXusIO.cpp
index b7a0f0d6f5db89b7ec398e5a57531e0ded79d34f..49d76247cdb18432c3c60ef822266cca746814dc 100644
--- a/Code/Mantid/Framework/MDEvents/src/BoxControllerNeXusIO.cpp
+++ b/Code/Mantid/Framework/MDEvents/src/BoxControllerNeXusIO.cpp
@@ -469,7 +469,7 @@ void BoxControllerNeXusIO::loadBlock(std::vector<double> & Block, const uint64_t
                      std::vector<int64_t> free_dims(2,2);
                      free_dims[0] = int64_t(freeSpaceBlocks.size()/2);
 
-                     m_File->writeUpdatedData("free_space_blocks", freeSpaceBlocks, free_dims);
+                     m_File->writeUpdatedData(g_DBDataName, freeSpaceBlocks, free_dims);
                  }
              }