diff --git a/deliver.sh b/deliver.sh
index 180e209..83fd85a 100755
--- a/deliver.sh
+++ b/deliver.sh
@@ -13,14 +13,14 @@ cp build.sbt ./wrap
 cp project/Dependencies.scala ./wrap/project/Dependencies.scala
 cp project/build.properties ./wrap/project/build.properties
 cp sbt.sh ./wrap
-(cd ./wrap/; tar czfv $username.gz .)
+(cd ./wrap/; tar czfv $username.tar.gz .)
 mv ./wrap/$username.gz .
 
 rm -rf ./wrap
 
 echo "Unwrapping and testing your wrapped package"
 mkdir wrapTest
-tar -C ./wrapTest -xvf $username.gz
+tar -C ./wrapTest -xvf $username.tar.gz
 ./wrapTest/sbt.sh test
 rm -rf ./wrapTest