diff --git a/poi-ooxml/src/test/java/org/apache/poi/xssf/eventusermodel/TestXSSFReader.java b/poi-ooxml/src/test/java/org/apache/poi/xssf/eventusermodel/TestXSSFReader.java
index 5506a364bd..96565866fb 100644
--- a/poi-ooxml/src/test/java/org/apache/poi/xssf/eventusermodel/TestXSSFReader.java
+++ b/poi-ooxml/src/test/java/org/apache/poi/xssf/eventusermodel/TestXSSFReader.java
@@ -344,6 +344,14 @@ public final class TestXSSFReader {
         }
     }
 
+    @Test
+    void test66612() throws Exception {
+        try (OPCPackage pkg = OPCPackage.open(_ssTests.openResourceAsStream("xlmmacro.xlsm"))) {
+            XSSFReader reader = new XSSFReader(pkg);
+            assertEquals("OCHSA0XBnVkZrG5OECromBJH43QoLIEZLit3eDix+rs=", hash(reader));
+        }
+    }
+
     @Test
     void testStrictOoxmlNotAllowed() throws Exception {
         assertThrows(POIXMLException.class, () -> {