diff --git a/Code/Mantid/Framework/MDEvents/test/FitMDTest.h b/Code/Mantid/Framework/MDEvents/test/FitMDTest.h
index 71b16b38a07a..3884d0ace900 100644
--- a/Code/Mantid/Framework/MDEvents/test/FitMDTest.h
+++ b/Code/Mantid/Framework/MDEvents/test/FitMDTest.h
@@ -46,6 +46,7 @@ class IMDWorkspaceTesterIterator: public IMDIterator
   virtual signal_t getInnerError(size_t ) const {return 0;}
   virtual bool getIsMasked() const {return false;}
   virtual std::vector<size_t> findNeighbourIndexes() const {throw std::runtime_error("findNeighbourIndexes not implemented on IMDWorkspaceTesterIterator");}
+  virtual size_t getLinearIndex() const {throw std::runtime_error("getLinearIndex not implemented on IMDWorkspaceTesterIterator");}
 };
 
 class IMDWorkspaceTester: public WorkspaceTester