diff --git a/src/sbin/livemedia-creator b/src/sbin/livemedia-creator
index 79d4a1a1..4b8f8ee1 100755
--- a/src/sbin/livemedia-creator
+++ b/src/sbin/livemedia-creator
@@ -931,10 +931,11 @@ def make_image(opts, ks):
     """
     # Disk size for a filesystem image should only be the size of /
     # to prevent surprises when using the same kickstart for different installations.
+    unique_partitions = dict((p.mountpoint, p) for p in ks.handler.partition.partitions)
     if opts.no_virt and (opts.make_iso or opts.make_fsimage):
-        disk_size = 2 + sum(p.size for p in ks.handler.partition.partitions if p.mountpoint == "/")
+        disk_size = 2 + sum(p.size for p in unique_partitions.values() if p.mountpoint == "/")
     else:
-        disk_size = 2 + sum(p.size for p in ks.handler.partition.partitions)
+        disk_size = 2 + sum(p.size for p in unique_partitions.values())
     log.info("disk_size = %sMiB", disk_size)
 
     if opts.image_name: