--- src/java/org/apache/poi/ss/usermodel/DataFormatter.java	(revision 1756983)
+++ src/java/org/apache/poi/ss/usermodel/DataFormatter.java	(working copy)
@@ -895,7 +895,7 @@ 
                 return cell.getRichStringCellValue().getString();
 
             case BOOLEAN :
-                return String.valueOf(cell.getBooleanCellValue());
+                return cell.getBooleanCellValue() ? "TRUE" : "FALSE";
             case BLANK :
                 return "";
             case ERROR:
--- src/testcases/org/apache/poi/ss/usermodel/TestDataFormatter.java	(revision 1756983)
+++ src/testcases/org/apache/poi/ss/usermodel/TestDataFormatter.java	(working copy)
@@ -597,6 +597,27 @@ 
         }
     }
 
+    @Test
+    public void testBoolean() throws IOException {
+        DataFormatter formatter = new DataFormatter();
+
+        // Create a spreadsheet with some TRUE/FALSE boolean values in it
+        Workbook wb = new HSSFWorkbook();
+        try {
+            Sheet s = wb.createSheet();
+            Row r = s.createRow(0);
+            Cell c = r.createCell(0);
+
+            c.setCellValue(true);
+            assertEquals("TRUE", formatter.formatCellValue(c));
+
+            c.setCellValue(false);
+            assertEquals("FALSE", formatter.formatCellValue(c));
+        } finally {
+            wb.close();
+        }
+    }
+
     /**
      * While we don't currently support using a locale code at
      *  the start of a format string to format it differently, we