diff --git a/src/conf/storage_source_conf.h b/src/conf/storage_source_conf.h
index 389c7b56d1..40db29c418 100644
--- a/src/conf/storage_source_conf.h
+++ b/src/conf/storage_source_conf.h
@@ -387,6 +387,11 @@ struct _virStorageSource {
     char *nfs_group;
     uid_t nfs_uid;
     gid_t nfs_gid;
+
+    /* We need a flag to remember that the threshold event for this source was
+     * registered with a full index (vda[3]) so that we can properly report just
+     * one event for it */
+    bool thresholdEventWithIndex;
 };
 
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(virStorageSource, virObjectUnref);
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 5fcd5e7f82..89e03fdf72 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1951,6 +1951,7 @@ qemuStorageSourcePrivateDataParse(xmlXPathContextPtr ctxt,
     g_autofree char *encalias = NULL;
     g_autofree char *httpcookiealias = NULL;
     g_autofree char *tlskeyalias = NULL;
+    g_autofree char *thresholdEventWithIndex = NULL;
 
     src->nodestorage = virXPathString("string(./nodenames/nodename[@type='storage']/@name)", ctxt);
     src->nodeformat = virXPathString("string(./nodenames/nodename[@type='format']/@name)", ctxt);
@@ -1990,6 +1991,10 @@ qemuStorageSourcePrivateDataParse(xmlXPathContextPtr ctxt,
     if (virStorageSourcePrivateDataParseRelPath(ctxt, src) < 0)
         return -1;
 
+    if ((thresholdEventWithIndex = virXPathString("string(./thresholdEvent/@indexUsed)", ctxt)) &&
+        virTristateBoolTypeFromString(thresholdEventWithIndex) == VIR_TRISTATE_BOOL_YES)
+        src->thresholdEventWithIndex = true;
+
     return 0;
 }
 
@@ -2044,6 +2049,9 @@ qemuStorageSourcePrivateDataFormat(virStorageSource *src,
 
     virXMLFormatElement(buf, "objects", NULL, &tmp);
 
+    if (src->thresholdEventWithIndex)
+        virBufferAddLit(buf, "<thresholdEvent indexUsed='yes'/>\n");
+
     return 0;
 }
 
diff --git a/tests/qemustatusxml2xmldata/modern-in.xml b/tests/qemustatusxml2xmldata/modern-in.xml
index ba0858a4ff..cc5fd1cb74 100644
--- a/tests/qemustatusxml2xmldata/modern-in.xml
+++ b/tests/qemustatusxml2xmldata/modern-in.xml
@@ -340,6 +340,7 @@
                 <secret type='tlskey' alias='tls-certificate-key-alias'/>
                 <TLSx509 alias='transport-alias'/>
               </objects>
+              <thresholdEvent indexUsed='yes'/>
             </privateData>
           </source>
           <backingStore/>