diff --git a/lib/linux_admin/disk.rb b/lib/linux_admin/disk.rb
index 13c9386..193d645 100644
--- a/lib/linux_admin/disk.rb
+++ b/lib/linux_admin/disk.rb
@@ -152,7 +152,7 @@ def create_partition(partition_type, *args)
       end
 
       id = partitions.empty? ? 1 : (partitions.last.id + 1)
-      options = parted_options_array('mkpart', '-a opt', partition_type, start, finish)
+      options = parted_options_array('mkpart', '-a', 'opt', partition_type, start, finish)
       run!(cmd(:parted), :params => { nil => options})
 
       partition = Partition.new(:disk           => self,
diff --git a/spec/disk_spec.rb b/spec/disk_spec.rb
index c9826b1..e2fbf2f 100644
--- a/spec/disk_spec.rb
+++ b/spec/disk_spec.rb
@@ -138,13 +138,13 @@
     end
 
     it "uses parted" do
-      params = ['--script', '/dev/hda', 'mkpart', '-a opt', 'primary', 1024, 2048]
+      params = ['--script', '/dev/hda', 'mkpart', '-a', 'opt', 'primary', 1024, 2048]
       @disk.should_receive(:run!).with(@disk.cmd(:parted), :params => { nil => params })
       @disk.create_partition 'primary', 1024
     end
 
     it "accepts start/end params" do
-      params = ['--script', '/dev/hda', 'mkpart', '-a opt', 'primary', "0%", "50%"]
+      params = ['--script', '/dev/hda', 'mkpart', '-a', 'opt', 'primary', "0%", "50%"]
       @disk.should_receive(:run!).with(@disk.cmd(:parted), :params => { nil => params })
       @disk.create_partition 'primary', "0%", "50%"
     end