diff --git a/pkg/disk/disk_test.go b/pkg/disk/disk_test.go
index 0f6d9d2787..ff92d09415 100644
--- a/pkg/disk/disk_test.go
+++ b/pkg/disk/disk_test.go
@@ -146,7 +146,7 @@ func blueprintApplied(pt *disk.PartitionTable, bp []blueprint.FilesystemCustomiz
 		}
 		for idx, ent := range path {
 			if sz, ok := ent.(disk.Sizeable); ok {
-				if sz.GetSize() < mnt.MinSize {
+				if sz.GetSize() < mnt.MinSize.Uint64() {
 					return fmt.Errorf("entity %d in the path from %s is smaller (%d) than the requested minsize %d", idx, mnt.Mountpoint, sz.GetSize(), mnt.MinSize)
 				}
 			}
@@ -178,7 +178,7 @@ func TestCreatePartitionTable(t *testing.T) {
 
 	sumSizes := func(bp []blueprint.FilesystemCustomization) (sum uint64) {
 		for _, mnt := range bp {
-			sum += mnt.MinSize
+			sum += mnt.MinSize.Uint64()
 		}
 		return sum
 	}
diff --git a/pkg/disk/partition_table.go b/pkg/disk/partition_table.go
index 9bed8eb611..c9fec6a905 100644
--- a/pkg/disk/partition_table.go
+++ b/pkg/disk/partition_table.go
@@ -428,7 +428,7 @@ func (pt *PartitionTable) applyCustomization(mountpoints []blueprint.FilesystemC
 	newMountpoints := []blueprint.FilesystemCustomization{}
 
 	for _, mnt := range mountpoints {
-		size := clampFSSize(mnt.Mountpoint, mnt.MinSize)
+		size := clampFSSize(mnt.Mountpoint, mnt.MinSize.Uint64())
 		if path := entityPath(pt, mnt.Mountpoint); len(path) != 0 {
 			size = alignEntityBranch(path, size)
 			resizeEntityBranch(path, size)
@@ -1237,7 +1237,7 @@ func NewCustomPartitionTable(customizations *blueprint.DiskCustomization, option
 		pt.EnsureDirectorySizes(options.RequiredMinSizes)
 	}
 
-	pt.relayout(customizations.MinSize)
+	pt.relayout(customizations.MinSize.Uint64())
 	pt.GenerateUUIDs(rng)
 
 	return pt, nil
@@ -1260,7 +1260,7 @@ func addPlainPartition(pt *PartitionTable, partition blueprint.PartitionCustomiz
 	newpart := Partition{
 		Type:     partType,
 		Bootable: false,
-		Size:     partition.MinSize,
+		Size:     partition.MinSize.Uint64(),
 		Payload: &Filesystem{
 			Type:         fstype,
 			Label:        partition.Label,
@@ -1310,7 +1310,7 @@ func addLVMPartition(pt *PartitionTable, partition blueprint.PartitionCustomizat
 			Mountpoint:   lv.Mountpoint,
 			FSTabOptions: "defaults", // TODO: add customization
 		}
-		if _, err := newvg.CreateLogicalVolume(lv.Name, lv.MinSize, newfs); err != nil {
+		if _, err := newvg.CreateLogicalVolume(lv.Name, lv.MinSize.Uint64(), newfs); err != nil {
 			return fmt.Errorf("error creating logical volume %q (%s): %w", lv.Name, lv.Mountpoint, err)
 		}
 	}
@@ -1318,7 +1318,7 @@ func addLVMPartition(pt *PartitionTable, partition blueprint.PartitionCustomizat
 	// create partition for volume group
 	newpart := Partition{
 		Type:     LVMPartitionGUID,
-		Size:     partition.MinSize,
+		Size:     partition.MinSize.Uint64(),
 		Bootable: false,
 		Payload:  newvg,
 	}
@@ -1345,7 +1345,7 @@ func addBtrfsPartition(pt *PartitionTable, partition blueprint.PartitionCustomiz
 		Type:     FilesystemDataGUID,
 		Bootable: false,
 		Payload:  newvol,
-		Size:     partition.MinSize,
+		Size:     partition.MinSize.Uint64(),
 	}
 
 	pt.Partitions = append(pt.Partitions, newpart)
diff --git a/pkg/distro/fedora/imagetype.go b/pkg/distro/fedora/imagetype.go
index 60aea17cf7..b06b304444 100644
--- a/pkg/distro/fedora/imagetype.go
+++ b/pkg/distro/fedora/imagetype.go
@@ -155,7 +155,7 @@ func (t *imageType) getPartitionTable(
 		if options.Size > 0 {
 			// user specified a size on the command line, so let's override the
 			// customization with the calculated/rounded imageSize
-			partitioning.MinSize = imageSize
+			partitioning.MinSize = datasizes.Size(imageSize)
 		}
 
 		partOptions := &disk.CustomPartitionTableOptions{