diff --git a/tests/pillar/compute_cluster.sls b/tests/pillar/compute_cluster.sls
index 28ded0c..4bbcfba 100644
--- a/tests/pillar/compute_cluster.sls
+++ b/tests/pillar/compute_cluster.sls
@@ -13,6 +13,7 @@
     report_interval: 60
     vnc_keymap: en-gb
     resume_guests_state_on_host_boot: True
+    preallocate_images: space
     bind:
       vnc_address: 127.0.0.1
       vnc_port: 6080
diff --git a/tests/pillar/compute_single.sls b/tests/pillar/compute_single.sls
index 08250ba..211a60e 100644
--- a/tests/pillar/compute_single.sls
+++ b/tests/pillar/compute_single.sls
@@ -7,6 +7,7 @@
     vncproxy_url: openstack:6080
     vnc_keymap: en-gb
     resume_guests_state_on_host_boot: False
+    preallocate_images: space
     cpu_mode: custom
     libvirt:
       cpu_model: IvyBridge
diff --git a/tests/pillar/compute_single_config_drive_options.sls b/tests/pillar/compute_single_config_drive_options.sls
index 75840b7..a3c03da 100644
--- a/tests/pillar/compute_single_config_drive_options.sls
+++ b/tests/pillar/compute_single_config_drive_options.sls
@@ -7,6 +7,7 @@
     vncproxy_url: openstack:6080
     vnc_keymap: en-gb
     resume_guests_state_on_host_boot: False
+    preallocate_images: space
     bind:
       vnc_address: 127.0.0.1
       vnc_port: 6080
@@ -60,4 +61,4 @@
     config_drive:
       cdrom: True
       format: iso9660
-      inject_password: True
\ No newline at end of file
+      inject_password: True