diff --git a/test-data/blank-disks/Makefile.am b/test-data/blank-disks/Makefile.am
index 72e85db68..79ca05442 100644
--- a/test-data/blank-disks/Makefile.am
+++ b/test-data/blank-disks/Makefile.am
@@ -32,19 +32,19 @@ CLEANFILES += $(files)
 
 # Blank disk images in various sizes and formats.
 blank-disk-1s.raw:
-	qemu-img create -f raw -o preallocation=off $@ 512
+	qemu-img create -f raw $@ 512
 
 blank-disk-1s.qcow2:
 	qemu-img create -f qcow2 -o preallocation=metadata $@ 512
 
 blank-disk-1K.raw:
-	qemu-img create -f raw -o preallocation=off $@ 1K
+	qemu-img create -f raw $@ 1K
 
 blank-disk-1K.qcow2:
 	qemu-img create -f qcow2 -o preallocation=metadata $@ 1K
 
 blank-disk-1M.raw:
-	qemu-img create -f raw -o preallocation=off $@ 1M
+	qemu-img create -f raw $@ 1M
 
 blank-disk-1M.qcow2:
 	qemu-img create -f qcow2 -o preallocation=metadata $@ 1M