diff --git a/components/fpspreadsheet/source/common/fpshtmlutils.pas b/components/fpspreadsheet/source/common/fpshtmlutils.pas
index 300a52771..70cc2c966 100644
--- a/components/fpspreadsheet/source/common/fpshtmlutils.pas
+++ b/components/fpspreadsheet/source/common/fpshtmlutils.pas
@@ -912,6 +912,8 @@ begin
                    (NoCaseTag = '</SUB>') or (NoCaseTag = '</SUP>') then ProcessFontRestore;
            'U': if (NoCaseTag = '</U>') then ProcessFontRestore;
          end;
+  else
+      FPlainText := FPlainText + ActualTag;
   end;
 end;