diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index 26c1b42428..0113c64f0f 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -2315,6 +2315,7 @@ qemuBlockStorageSourceCreateGetFormatPropsQcow2(virStorageSourcePtr src,
                                  "s:file", src->nodestorage,
                                  "U:size", src->capacity,
                                  "S:version", qcow2version,
+                                 "P:cluster-size", src->clusterSize,
                                  NULL) < 0)
         return -1;
 
diff --git a/src/util/virstoragefile.h b/src/util/virstoragefile.h
index f73b3ee005..87763cf389 100644
--- a/src/util/virstoragefile.h
+++ b/src/util/virstoragefile.h
@@ -318,6 +318,7 @@ struct _virStorageSource {
     unsigned long long capacity; /* in bytes, 0 if unknown */
     unsigned long long allocation; /* in bytes, 0 if unknown */
     unsigned long long physical; /* in bytes, 0 if unknown */
+    unsigned long long clusterSize; /* in bytes, 0 if unknown */
     bool has_allocation; /* Set to true when provided in XML */
 
     size_t nseclabels;