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-rw-r--r--odk/examples/DevelopersGuide/Charts/CalcHelper.java2
1 files changed, 1 insertions, 1 deletions
diff --git a/odk/examples/DevelopersGuide/Charts/CalcHelper.java b/odk/examples/DevelopersGuide/Charts/CalcHelper.java
index 50364bdc0fbd..242e7676853d 100644
--- a/odk/examples/DevelopersGuide/Charts/CalcHelper.java
+++ b/odk/examples/DevelopersGuide/Charts/CalcHelper.java
@@ -342,7 +342,7 @@ public class CalcHelper
private static final String msDataSheetName = "Data";
private static final String msChartSheetName = "Chart";
- private XSpreadsheetDocument maSpreadSheetDoc;
+ private final XSpreadsheetDocument maSpreadSheetDoc;