diff --git a/runtime/org.eclipse.rcptt.ecl.data.apache.poi.impl/src/org/eclipse/rcptt/ecl/data/apache/poi/impl/internal/commands/WriteExcelFileService.java b/runtime/org.eclipse.rcptt.ecl.data.apache.poi.impl/src/org/eclipse/rcptt/ecl/data/apache/poi/impl/internal/commands/WriteExcelFileService.java
index 8fb7e7a..06e775a 100644
--- a/runtime/org.eclipse.rcptt.ecl.data.apache.poi.impl/src/org/eclipse/rcptt/ecl/data/apache/poi/impl/internal/commands/WriteExcelFileService.java
+++ b/runtime/org.eclipse.rcptt.ecl.data.apache.poi.impl/src/org/eclipse/rcptt/ecl/data/apache/poi/impl/internal/commands/WriteExcelFileService.java
@@ -55,11 +55,13 @@
 				sheetName = String.format(SHEET_NAME_PATTERN, sheetnum);
 			}
 			Sheet sheet = book.getSheet(sheetName);
+			boolean newSheet = false;
 			if (sheet == null) {
 				sheet = book.createSheet(sheetName);
+				newSheet = true;
 			}
 			writeTable(sheet, table);
-			if (!isAppend) {
+			if (newSheet) {
 				autoSizeColumns(sheet);
 			}
 			context.getOutput().write(table);