diff --git a/src/qemu/qemu_backup.c b/src/qemu/qemu_backup.c
index 3bd59402dc..8dc9d2504d 100644
--- a/src/qemu/qemu_backup.c
+++ b/src/qemu/qemu_backup.c
@@ -148,6 +148,7 @@ qemuBackupDiskDataCleanupOne(virDomainObjPtr vm,
 
     qemuBlockStorageSourceChainDataFree(dd->crdata);
     virObjectUnref(dd->terminator);
+    g_free(dd->incrementalBitmap);
 }