diff --git a/DataFormats/SiStripCluster/src/classes_def.xml b/DataFormats/SiStripCluster/src/classes_def.xml
index 506a910944f60..c145107c3afe4 100755
--- a/DataFormats/SiStripCluster/src/classes_def.xml
+++ b/DataFormats/SiStripCluster/src/classes_def.xml
@@ -26,6 +26,7 @@
 
  <class name="SiStripApproximateCluster" ClassVersion="4">
   <version ClassVersion="4" checksum="2854791577"/>
+  <version ClassVersion="3" checksum="2041370183"/>
  </class>
 
  <class name="edmNew::DetSetVector<SiStripApproximateCluster>"/>