diff --git a/cp-to-solution.sh b/cp-to-solution.sh
index dd7fc5edac52ab218a29d35ff4d9d42f00c52b87..e8541d33df1b247834110733c9f2baf331c13918 100755
--- a/cp-to-solution.sh
+++ b/cp-to-solution.sh
@@ -44,7 +44,7 @@ function copy_to_ttc() {(
 
   # ensure directory exists and unpack into it
   mkdir -p ../ttc2018liveContest/solutions/$name
-  aunpack -q solve/build/distributions/solve-1.0-SNAPSHOT.tar solve-1.0-SNAPSHOT/bin/ solve-1.0-SNAPSHOT/lib/ -X ../ttc2018liveContest/solutions/$name/
+  tar -xf solve/build/distributions/solve-1.0-SNAPSHOT.tar -C ../ttc2018liveContest/solutions/$name/ solve-1.0-SNAPSHOT/bin/ solve-1.0-SNAPSHOT/lib/
 
   # cp solution.ini
   cp solution.ini ../ttc2018liveContest/solutions/$name/