diff --git a/Code/Mantid/Framework/MDEvents/src/AffineMatrixParameter.cpp b/Code/Mantid/Framework/MDEvents/src/AffineMatrixParameter.cpp
index 643badd778cd..137bc1429ef1 100644
--- a/Code/Mantid/Framework/MDEvents/src/AffineMatrixParameter.cpp
+++ b/Code/Mantid/Framework/MDEvents/src/AffineMatrixParameter.cpp
@@ -28,11 +28,12 @@ AffineMatrixParameter::AffineMatrixParameter(size_t outD, size_t inD)
 //----------------------------------------------------------------------------------------------
 /// Destructor
 AffineMatrixParameter::~AffineMatrixParameter() {
-  if (m_rawMatrix) {
-    delete[] * m_rawMatrix;
-    delete[] m_rawMatrix;
-  }
+  // delete array of pointers to rows
+  delete[] m_rawMatrix;
   m_rawMatrix = NULL;
+
+  // delete large mem block holding the matrix
+  delete[] m_rawMem;
   m_rawMem = NULL;
 }