diff --git a/Code/Mantid/Framework/MDAlgorithms/test/MergeMDFilesTest.h b/Code/Mantid/Framework/MDAlgorithms/test/MergeMDFilesTest.h
index df1a2e22b65f..565cc845f4cc 100644
--- a/Code/Mantid/Framework/MDAlgorithms/test/MergeMDFilesTest.h
+++ b/Code/Mantid/Framework/MDAlgorithms/test/MergeMDFilesTest.h
@@ -33,9 +33,9 @@ class MergeMDFilesTest : public CxxTest::TestSuite
     do_test_exec("");
   }
 
-  void xest_exec_fileBacked()
+  void test_exec_fileBacked()
   {
-    //do_test_exec("MergeMDFilesTest_OutputWS.nxs");
+    do_test_exec("MergeMDFilesTest_OutputWS.nxs");
   }
   
   void do_test_exec(std::string OutputFilename)
diff --git a/Code/Mantid/Framework/MDAlgorithms/test/SliceMDTest.h b/Code/Mantid/Framework/MDAlgorithms/test/SliceMDTest.h
index 69a6ffdda8b5..ea0042ab46a2 100644
--- a/Code/Mantid/Framework/MDAlgorithms/test/SliceMDTest.h
+++ b/Code/Mantid/Framework/MDAlgorithms/test/SliceMDTest.h
@@ -214,9 +214,9 @@ class SliceMDTest : public CxxTest::TestSuite
   }
 
 
-  void xest_exec_3D_fileBackedOutput()
+  void test_exec_3D_fileBackedOutput()
   { 
-  //  do_test_exec<MDEvent<3>,3>("Axis0,2.0,8.0, 3", "Axis1,2.0,8.0, 3", "Axis2,2.0,8.0, 3", "",  6*6*6 /*# of events*/, 3 /*dims*/, false /*WillFail*/, "SliceMDTest_output.nxs");
+    do_test_exec<MDEvent<3>,3>("Axis0,2.0,8.0, 3", "Axis1,2.0,8.0, 3", "Axis2,2.0,8.0, 3", "",  6*6*6 /*# of events*/, 3 /*dims*/, false /*WillFail*/, "SliceMDTest_output.nxs");
   }
 
   void test_dont_use_max_recursion_depth()