diff --git a/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java b/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java
index 5d0471e..1d6fe91 100644
--- a/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java
+++ b/excel-importer-test/src_test/com/axonivy/util/excel/test/TestExcelReader.java
@@ -6,11 +6,9 @@
 import java.nio.file.Path;
 import java.sql.Timestamp;
 import java.util.List;
-
 import org.apache.poi.ss.usermodel.Workbook;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
-
 import com.axonivy.util.excel.importer.Column;
 import com.axonivy.util.excel.importer.ExcelLoader;
 import com.axonivy.util.excel.importer.ExcelReader;
@@ -33,5 +31,17 @@ void parseColumns_xlsx(@TempDir Path dir) throws IOException {
         new Column("Column contains both text and numeric", String.class, 255)
     );
   }
+  
+  @Test
+  void parseColumnsOver255Characters_xlsx(@TempDir Path dir) throws IOException {
+    Path path = dir.resolve("customers.xlsx");
+    TstRes.loadTo(path, "sample_over_255_characters.xlsx");
+    Workbook wb = ExcelLoader.load(path);
+    List<Column> columns = ExcelReader.parseColumns(wb.getSheetAt(0));
+    assertThat(columns).extracting(Column::getName).contains("FirstName", "LastName" , "Summary");
+    assertThat(columns).contains(new Column("FirstName", String.class, 255),
+    		new Column("LastName", String.class, 255),
+    		new Column("Summary", String.class, 823));
+  }
 
 }
diff --git a/excel-importer-test/src_test/com/axonivy/util/excel/test/sample_over_255_characters.xlsx b/excel-importer-test/src_test/com/axonivy/util/excel/test/sample_over_255_characters.xlsx
new file mode 100644
index 0000000..61eb94f
Binary files /dev/null and b/excel-importer-test/src_test/com/axonivy/util/excel/test/sample_over_255_characters.xlsx differ
diff --git a/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java b/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java
index 5c9ffd4..1300ae1 100644
--- a/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java
+++ b/excel-importer/src/com/axonivy/util/excel/importer/ExcelReader.java
@@ -8,6 +8,7 @@
 import java.util.List;
 import java.util.Map;
 
+import org.apache.commons.lang3.ObjectUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.CellType;
@@ -91,7 +92,9 @@ private static void updateColumn(Column column, Cell cell) {
     }
     if (cell.getCellType() == CellType.STRING) {
       column.setType(String.class);
-      column.setDatabaseFieldLength(DEFAULT_STRING_LENGTH);
+      if (ObjectUtils.isEmpty(column.getDatabaseFieldLength())) {
+        column.setDatabaseFieldLength(DEFAULT_STRING_LENGTH);
+      }
     }
     if (column.getType().equals(String.class)) {
       var cellValue = getCellValueAsString(cell);