diff --git a/src/java/org/apache/poi/hssf/model/InternalWorkbook.java b/src/java/org/apache/poi/hssf/model/InternalWorkbook.java
index d16eec62ee..46d8678229 100644
--- a/src/java/org/apache/poi/hssf/model/InternalWorkbook.java
+++ b/src/java/org/apache/poi/hssf/model/InternalWorkbook.java
@@ -136,6 +136,7 @@ public final class InternalWorkbook {
         "Workbook", // as per BIFF8 spec
         "WORKBOOK", // Typically from third party programs
         "BOOK",     // Typically odd Crystal Reports exports
+        "WorkBook", // Another third party program special
     };
     /**
      * Name of older (pre-Excel 97) Workbook streams, which
@@ -2280,4 +2281,4 @@ public final class InternalWorkbook {
     public WorkbookRecordList getWorkbookRecordList() {
         return records;
     }
-}
\ No newline at end of file
+}