diff --git a/layout/xul/base/src/nsImageBoxFrame.cpp b/layout/xul/base/src/nsImageBoxFrame.cpp
index db4e3001df21..6c839e23d114 100644
--- a/layout/xul/base/src/nsImageBoxFrame.cpp
+++ b/layout/xul/base/src/nsImageBoxFrame.cpp
@@ -477,7 +477,9 @@ nsImageBoxFrame::GetPrefSize(nsBoxLayoutState& aState)
   AddInset(size);
   nsIBox::AddCSSPrefSize(aState, this, size);
 
-  BoundsCheck(GetMinSize(aState), size, GetMaxSize(aState));
+  nsSize minSize = GetMinSize(aState);
+  nsSize maxSize = GetMaxSize(aState);
+  BoundsCheck(minSize, size, maxSize);
 
   return size;
 }
diff --git a/layout/xul/base/src/nsLeafBoxFrame.cpp b/layout/xul/base/src/nsLeafBoxFrame.cpp
index 5086a1898879..b4535222d05d 100644
--- a/layout/xul/base/src/nsLeafBoxFrame.cpp
+++ b/layout/xul/base/src/nsLeafBoxFrame.cpp
@@ -304,7 +304,9 @@ nsLeafBoxFrame::Reflow(nsPresContext*   aPresContext,
   // if we are told to layout intrinic then get our preferred size.
   if (computedSize.width == NS_INTRINSICSIZE || computedSize.height == NS_INTRINSICSIZE) {
      prefSize = GetPrefSize(state);
-     BoundsCheck(GetMinSize(state), prefSize, GetMaxSize(state));
+     nsSize minSize = GetMinSize(state);
+     nsSize maxSize = GetMaxSize(state);
+     BoundsCheck(minSize, prefSize, maxSize);
   }
 
   // get our desiredSize