diff --git a/apps/opencs/model/world/idtable.cpp b/apps/opencs/model/world/idtable.cpp
index cebd0ebdb..9dbe38998 100644
--- a/apps/opencs/model/world/idtable.cpp
+++ b/apps/opencs/model/world/idtable.cpp
@@ -2,6 +2,8 @@
 
 #include <stdexcept>
 
+#include <components/esm/cellid.hpp>
+
 #include "collectionbase.hpp"
 #include "columnbase.hpp"
 
@@ -259,7 +261,7 @@ std::pair<CSMWorld::UniversalId, std::string> CSMWorld::IdTable::view (int row)
         return std::make_pair (UniversalId::Type_None, "");
 
     if (id[0]=='#')
-        id = "sys::default";
+        id = ESM::CellId::sDefaultWorldspace;
 
     return std::make_pair (UniversalId (UniversalId::Type_Scene, id), hint);
 }
diff --git a/apps/opencs/view/world/regionmap.cpp b/apps/opencs/view/world/regionmap.cpp
index 4de470dbc..31e5d94ca 100644
--- a/apps/opencs/view/world/regionmap.cpp
+++ b/apps/opencs/view/world/regionmap.cpp
@@ -303,7 +303,7 @@ void CSVWorld::RegionMap::view()
         hint << cellId;
     }
 
-    emit editRequest (CSMWorld::UniversalId (CSMWorld::UniversalId::Type_Scene, "sys::default"),
+    emit editRequest (CSMWorld::UniversalId (CSMWorld::UniversalId::Type_Scene, ESM::CellId::sDefaultWorldspace),
         hint.str());
 }
 
diff --git a/apps/opencs/view/world/scenesubview.cpp b/apps/opencs/view/world/scenesubview.cpp
index 624029353..c84818b37 100644
--- a/apps/opencs/view/world/scenesubview.cpp
+++ b/apps/opencs/view/world/scenesubview.cpp
@@ -38,7 +38,7 @@ CSVWorld::SceneSubView::SceneSubView (const CSMWorld::UniversalId& id, CSMDoc::D
     CSVRender::WorldspaceWidget* worldspaceWidget = NULL;
     widgetType whatWidget;
 
-    if (id.getId()=="sys::default")
+    if (id.getId()==ESM::CellId::sDefaultWorldspace)
     {
         whatWidget = widget_Paged;
 
@@ -160,7 +160,7 @@ void CSVWorld::SceneSubView::cellSelectionChanged (const CSMWorld::UniversalId&
 
 void CSVWorld::SceneSubView::cellSelectionChanged (const CSMWorld::CellSelection& selection)
 {
-    setUniversalId(CSMWorld::UniversalId(CSMWorld::UniversalId::Type_Scene, "sys::default"));
+    setUniversalId(CSMWorld::UniversalId(CSMWorld::UniversalId::Type_Scene, ESM::CellId::sDefaultWorldspace));
     int size = selection.getSize();
 
     std::ostringstream stream;
diff --git a/apps/openmw/mwgui/mapwindow.cpp b/apps/openmw/mwgui/mapwindow.cpp
index 1b8d5ab43..7c52f09cb 100644
--- a/apps/openmw/mwgui/mapwindow.cpp
+++ b/apps/openmw/mwgui/mapwindow.cpp
@@ -322,7 +322,7 @@ namespace MWGui
             {
                 ESM::CellId cellId;
                 cellId.mPaged = !mInterior;
-                cellId.mWorldspace = (mInterior ? mPrefix : "sys::default");
+                cellId.mWorldspace = (mInterior ? mPrefix : ESM::CellId::sDefaultWorldspace);
                 cellId.mIndex.mX = mCurX+dX;
                 cellId.mIndex.mY = mCurY+dY;
 
@@ -738,7 +738,7 @@ namespace MWGui
             mEditingMarker.mCell.mWorldspace = LocalMapBase::mPrefix;
         else
         {
-            mEditingMarker.mCell.mWorldspace = "sys::default";
+            mEditingMarker.mCell.mWorldspace = ESM::CellId::sDefaultWorldspace;
             mEditingMarker.mCell.mIndex.mX = x;
             mEditingMarker.mCell.mIndex.mY = y;
         }
@@ -848,7 +848,7 @@ namespace MWGui
         ESM::CellId cellId;
         cellId.mIndex.mX = x;
         cellId.mIndex.mY = y;
-        cellId.mWorldspace = "sys::default";
+        cellId.mWorldspace = ESM::CellId::sDefaultWorldspace;
         cellId.mPaged = true;
         CustomMarkerCollection::RangeType markers = mCustomMarkers.getMarkers(cellId);
         std::vector<std::string> destNotes;
diff --git a/apps/openmw/mwworld/cells.cpp b/apps/openmw/mwworld/cells.cpp
index 47b2af053..384d7e124 100644
--- a/apps/openmw/mwworld/cells.cpp
+++ b/apps/openmw/mwworld/cells.cpp
@@ -105,7 +105,7 @@ MWWorld::CellStore *MWWorld::Cells::getExterior (int x, int y)
         {
             // Cell isn't predefined. Make one on the fly.
             ESM::Cell record;
-            record.mCellId.mWorldspace = "sys::default";
+            record.mCellId.mWorldspace = ESM::CellId::sDefaultWorldspace;
             record.mCellId.mPaged = true;
             record.mCellId.mIndex.mX = x;
             record.mCellId.mIndex.mY = y;
diff --git a/apps/openmw/mwworld/worldimp.cpp b/apps/openmw/mwworld/worldimp.cpp
index cb31d6e0d..ec581c3e3 100644
--- a/apps/openmw/mwworld/worldimp.cpp
+++ b/apps/openmw/mwworld/worldimp.cpp
@@ -972,7 +972,7 @@ namespace MWWorld
     {
         mPhysics->clearQueuedMovement();
 
-        if (changeEvent && mCurrentWorldSpace != "sys::default") // FIXME
+        if (changeEvent && mCurrentWorldSpace != ESM::CellId::sDefaultWorldspace)
         {
             // changed worldspace
             mProjectileManager->clear();
diff --git a/components/esm/cellid.cpp b/components/esm/cellid.cpp
index f77e2eb55..ad91d30e0 100644
--- a/components/esm/cellid.cpp
+++ b/components/esm/cellid.cpp
@@ -3,6 +3,8 @@
 #include "esmreader.hpp"
 #include "esmwriter.hpp"
 
+const std::string ESM::CellId::sDefaultWorldspace = "sys::default";
+
 void ESM::CellId::load (ESMReader &esm)
 {
     mWorldspace = esm.getHNString ("SPAC");
diff --git a/components/esm/cellid.hpp b/components/esm/cellid.hpp
index 56d5a674e..a28b71794 100644
--- a/components/esm/cellid.hpp
+++ b/components/esm/cellid.hpp
@@ -20,6 +20,8 @@ namespace ESM
         CellIndex mIndex;
         bool mPaged;
 
+        static const std::string sDefaultWorldspace;
+
         void load (ESMReader &esm);
         void save (ESMWriter &esm) const;
     };
diff --git a/components/esm/loadcell.cpp b/components/esm/loadcell.cpp
index 3a8a11779..7c4349d31 100644
--- a/components/esm/loadcell.cpp
+++ b/components/esm/loadcell.cpp
@@ -96,7 +96,7 @@ namespace ESM
 
         if (mCellId.mPaged)
         {
-            mCellId.mWorldspace = "sys::default";
+            mCellId.mWorldspace = ESM::CellId::sDefaultWorldspace;
             mCellId.mIndex.mX = mData.mX;
             mCellId.mIndex.mY = mData.mY;
         }