diff --git a/api/src/org/labkey/api/reader/jxl/JxlCellStyle.java b/api/src/org/labkey/api/reader/jxl/JxlCellStyle.java
index f5e460e1085..e67a89fda91 100644
--- a/api/src/org/labkey/api/reader/jxl/JxlCellStyle.java
+++ b/api/src/org/labkey/api/reader/jxl/JxlCellStyle.java
@@ -18,6 +18,7 @@
 import jxl.format.Alignment;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.poi.ss.usermodel.BorderStyle;
+import org.apache.poi.ss.usermodel.CellPropertyType;
 import org.apache.poi.ss.usermodel.CellStyle;
 import org.apache.poi.ss.usermodel.Color;
 import org.apache.poi.ss.usermodel.FillPatternType;
@@ -25,6 +26,7 @@
 import org.apache.poi.ss.usermodel.HorizontalAlignment;
 import org.apache.poi.ss.usermodel.VerticalAlignment;
 
+import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -64,6 +66,16 @@ public short getDataFormat()
         return 0;
     }
 
+    @Override
+    public void invalidateCachedProperties()
+    {}
+
+    @Override
+    public EnumMap<CellPropertyType,Object> getFormatProperties()
+    {
+        return null;
+    }
+
     @Override
     public String getDataFormatString()
     {