diff --git a/poi/src/main/java/org/apache/poi/ss/util/CellUtil.java b/poi/src/main/java/org/apache/poi/ss/util/CellUtil.java
index 1a7c4aaf65..438044b7d0 100644
--- a/poi/src/main/java/org/apache/poi/ss/util/CellUtil.java
+++ b/poi/src/main/java/org/apache/poi/ss/util/CellUtil.java
@@ -233,7 +233,7 @@ public final class CellUtil {
     public static void setFont(Cell cell, Font font) {
         // Check if font belongs to workbook
         Workbook wb = cell.getSheet().getWorkbook();
-        final int fontIndex = font.getIndexAsInt();
+        final int fontIndex = font.getIndex();
         if (!wb.getFontAt(fontIndex).equals(font)) {
             throw new IllegalArgumentException("Font does not belong to this workbook");
         }