diff --git a/src/ooxml/testcases/org/apache/poi/xssf/streaming/TestSXSSFWorkbookWithCustomZipEntrySource.java b/src/ooxml/testcases/org/apache/poi/xssf/streaming/TestSXSSFWorkbookWithCustomZipEntrySource.java
index 781b6df279..7523f775e4 100644
--- a/src/ooxml/testcases/org/apache/poi/xssf/streaming/TestSXSSFWorkbookWithCustomZipEntrySource.java
+++ b/src/ooxml/testcases/org/apache/poi/xssf/streaming/TestSXSSFWorkbookWithCustomZipEntrySource.java
@@ -165,6 +165,7 @@ public final class TestSXSSFWorkbookWithCustomZipEntrySource {
             } catch (GeneralSecurityException e) {
                 throw new IOException(e);
             } finally {
+                tempData.dispose();
                 IOUtils.closeQuietly(source);
             }
         }