diff --git a/layout/xul/base/src/grid/nsGridLayout2.h b/layout/xul/base/src/grid/nsGridLayout2.h
index fbf6808f3f6..bbaec5aa911 100644
--- a/layout/xul/base/src/grid/nsGridLayout2.h
+++ b/layout/xul/base/src/grid/nsGridLayout2.h
@@ -78,7 +78,6 @@ public:
   virtual void DirtyRows(nsIBox* aBox, nsBoxLayoutState& aState) { NS_NOTREACHED("Should not be called"); }
   virtual PRInt32 BuildRows(nsIBox* aBox, nsGridRow* aRows) { NS_NOTREACHED("Should not be called"); return 0; }
   virtual nsMargin GetTotalMargin(nsIBox* aBox, PRBool aIsHorizontal);
-  virtual PRInt32 GetRowCount() { NS_NOTREACHED("Should not be called"); return 0; }
   virtual Type GetType() { return eGrid; }
   NS_IMETHOD ChildrenInserted(nsIBox* aBox, nsBoxLayoutState& aState,
                               nsIBox* aPrevBox, nsIBox* aChildList);
diff --git a/layout/xul/base/src/grid/nsGridRowLeafLayout.h b/layout/xul/base/src/grid/nsGridRowLeafLayout.h
index 881a17aa76d..6404363e86c 100644
--- a/layout/xul/base/src/grid/nsGridRowLeafLayout.h
+++ b/layout/xul/base/src/grid/nsGridRowLeafLayout.h
@@ -67,7 +67,6 @@ public:
   virtual void CountRowsColumns(nsIBox* aBox, PRInt32& aRowCount, PRInt32& aComputedColumnCount);
   virtual void DirtyRows(nsIBox* aBox, nsBoxLayoutState& aState);
   virtual PRInt32 BuildRows(nsIBox* aBox, nsGridRow* aRows);
-  virtual PRInt32 GetRowCount() { return 1; }
   virtual Type GetType() { return eRowLeaf; }
 
 protected:
diff --git a/layout/xul/base/src/grid/nsIGridPart.h b/layout/xul/base/src/grid/nsIGridPart.h
index cc6df215764..bd2a20fbc8e 100644
--- a/layout/xul/base/src/grid/nsIGridPart.h
+++ b/layout/xul/base/src/grid/nsIGridPart.h
@@ -104,7 +104,7 @@ public:
   virtual void DirtyRows(nsIBox* aBox, nsBoxLayoutState& aState)=0;
   virtual PRInt32 BuildRows(nsIBox* aBox, nsGridRow* aRows)=0;
   virtual nsMargin GetTotalMargin(nsIBox* aBox, PRBool aIsHorizontal)=0;
-  virtual PRInt32 GetRowCount()=0;
+  virtual PRInt32 GetRowCount() { return 1; }
   
   /**
    * Return the level of the grid hierarchy this grid part represents.