diff --git a/lib/lvm/snapshot.rb b/lib/lvm/snapshot.rb
index 6189e66..1deea42 100644
--- a/lib/lvm/snapshot.rb
+++ b/lib/lvm/snapshot.rb
@@ -108,6 +108,6 @@ def metadata_header
 	end
 
 	def metadata_device
-		"/dev/mapper/#{@vg}-#{@lv}-cow"
+		"/dev/mapper/#{@vg}-#{@lv.gsub('-', '--')}-cow"
 	end
 end