diff --git a/layout/xul/base/src/tree/src/nsTreeBodyFrame.cpp b/layout/xul/base/src/tree/src/nsTreeBodyFrame.cpp
index 68d0a9a07ab..97ff17ae131 100644
--- a/layout/xul/base/src/tree/src/nsTreeBodyFrame.cpp
+++ b/layout/xul/base/src/tree/src/nsTreeBodyFrame.cpp
@@ -453,7 +453,6 @@ nsTreeBodyFrame::GetMinSize(nsBoxLayoutState& aBoxLayoutState, nsSize& aSize)
     if (!rows.IsEmpty()) {
       PRInt32 err;
       desiredRows = rows.ToInteger(&err);
-      mHasFixedRowCount = PR_TRUE;
       mPageCount = desiredRows;
     }
     else {