diff --git a/mozilla/layout/tables/nsTableFrame.cpp b/mozilla/layout/tables/nsTableFrame.cpp
index d1f1d944bfa..2e505e9f25a 100644
--- a/mozilla/layout/tables/nsTableFrame.cpp
+++ b/mozilla/layout/tables/nsTableFrame.cpp
@@ -1743,6 +1743,7 @@ nsTableFrame::RequestSpecialHeightReflow(const nsHTMLReflowState& aReflowState)
     NS_ASSERTION(IS_TABLE_CELL(frameType) ||
                  nsGkAtoms::tableRowFrame == frameType ||
                  nsGkAtoms::tableRowGroupFrame == frameType ||
+                 nsGkAtoms::scrollFrame == frameType ||
                  nsGkAtoms::tableFrame == frameType,
                  "unexpected frame type");