diff --git a/Code/Mantid/Framework/Geometry/inc/MantidGeometry/MDGeometry/MDDimensionExtents.h b/Code/Mantid/Framework/Geometry/inc/MantidGeometry/MDGeometry/MDDimensionExtents.h
index 65d940db46fe6da9e24ea84a977dc2624bd218ef..848e4610e05ec0371997e71d9928aee106028637 100644
--- a/Code/Mantid/Framework/Geometry/inc/MantidGeometry/MDGeometry/MDDimensionExtents.h
+++ b/Code/Mantid/Framework/Geometry/inc/MantidGeometry/MDGeometry/MDDimensionExtents.h
@@ -37,8 +37,8 @@ namespace Geometry
     /** Empty constructor - reset everything.
      *  */
     MDDimensionExtents() :
-      min( coord_t(1e30) ),
-      max( coord_t(-1e30) )
+      min( 1e30f ),
+      max( -1e30f )
     { }
 
     // ---- Public members ----------
diff --git a/Code/Mantid/Framework/Geometry/src/MDGeometry/MDPlane.cpp b/Code/Mantid/Framework/Geometry/src/MDGeometry/MDPlane.cpp
index ffcda27627186d21b5b1cfe059d8a49fb45acbf8..570c9a69df0fdd1605f3050a3540b149c092df22 100644
--- a/Code/Mantid/Framework/Geometry/src/MDGeometry/MDPlane.cpp
+++ b/Code/Mantid/Framework/Geometry/src/MDGeometry/MDPlane.cpp
@@ -94,7 +94,7 @@ namespace Geometry
         // Flip the normal over
         delete [] this->m_normal;
         for (size_t d=0; d<normal.getNumDims(); d++)
-          normal[d] = coord_t(-1.0) * normal[d];
+          normal[d] = -1.0f * normal[d];
         // And re-construct
         construct(normal, origin);
       }
diff --git a/Code/Mantid/Framework/MDEvents/test/MDBoxIteratorTest.h b/Code/Mantid/Framework/MDEvents/test/MDBoxIteratorTest.h
index fe0e260c52b90155d25e503c6ed1fad5f69959de..3cbf93b4204e3c1677df5c62d52cac5c0354b891 100644
--- a/Code/Mantid/Framework/MDEvents/test/MDBoxIteratorTest.h
+++ b/Code/Mantid/Framework/MDEvents/test/MDBoxIteratorTest.h
@@ -589,7 +589,7 @@ public:
       coord_t normal1[3] = {coord_t(+1.000), 0, 0};
       coord_t origin1[3] = {coord_t(+2.201), 0, 0};
       function->addPlane(MDPlane(3,normal1, origin1));
-      coord_t normal2[3] = {coord_t(-1.000), 0, 0};
+      coord_t normal2[3] = {-1.000f, 0, 0};
       coord_t origin2[3] = {coord_t(+2.399), 0, 0};
       function->addPlane(MDPlane(3,normal2, origin2));
       top->getBoxes(boxes, 20, leafOnly, function);
@@ -597,7 +597,7 @@ public:
     else if (ImplicitFunction==3)
     {
       // Box in 3D where -5 < (x,y,z) < +10
-      std::vector<coord_t> min(3, coord_t(-4.999));
+      std::vector<coord_t> min(3, -4.999f);
       std::vector<coord_t> max(3, coord_t(+9.999));
       function = new MDBoxImplicitFunction(min, max);
       top->getBoxes(boxes, 20, leafOnly, function);
diff --git a/Code/Mantid/Framework/MDEvents/test/MDEventWorkspaceTest.h b/Code/Mantid/Framework/MDEvents/test/MDEventWorkspaceTest.h
index 8363352d23eaba9f7c0c58eb87d9da1d1a4c8749..47001fb1f6a878b4bf1d617f81d36a48ad2e8d3e 100644
--- a/Code/Mantid/Framework/MDEvents/test/MDEventWorkspaceTest.h
+++ b/Code/Mantid/Framework/MDEvents/test/MDEventWorkspaceTest.h
@@ -180,7 +180,7 @@ public:
     MDEventWorkspace3Lean::sptr ew = MDEventsTestHelper::makeMDEW<3>(4, 0.0, 4.0, 1);
     coord_t coords1[3] = {1.5,1.5,1.5};
     coord_t coords2[3] = {2.5,2.5,2.5};
-    coord_t coords3[3] = {coord_t(-0.1), 2, 2};
+    coord_t coords3[3] = {-0.1f, 2, 2};
     coord_t coords4[3] = {2, 2, 4.1f};
     ew->addEvent(MDLeanEvent<3>(2.0, 2.0, coords2));
     ew->refreshCache();
diff --git a/Code/Mantid/MantidQt/SliceViewer/src/SliceViewer.cpp b/Code/Mantid/MantidQt/SliceViewer/src/SliceViewer.cpp
index 14aaa6c7952da3b55af4544884234cb06f873944..62b506398f2363e231aeb68a5e179e797c725178 100644
--- a/Code/Mantid/MantidQt/SliceViewer/src/SliceViewer.cpp
+++ b/Code/Mantid/MantidQt/SliceViewer/src/SliceViewer.cpp
@@ -1058,7 +1058,7 @@ void SliceViewer::findRangeSlice()
     else
     {
       // Is a slice. Take a slice of widht = binWidth
-      min[d] = VMD_t(widget->getSlicePoint()) - dim->getBinWidth() * VMD_t(0.45);
+      min[d] = VMD_t(widget->getSlicePoint()) - dim->getBinWidth() * 0.45f;
       max[d] = min[d] + dim->getBinWidth();
     }
   }