diff --git a/jenkins-build.sh b/jenkins-build.sh
index bf1aaedb..14039265 100755
--- a/jenkins-build.sh
+++ b/jenkins-build.sh
@@ -1,6 +1,7 @@
 #!/bin/bash -ex
 
 cabal update
+rm -rf patching/tarballs
 (cd patching/ && ./scripts/create-tarballs.sh)
 cabal install
 cabal install Cabal-$(cabal --version | sed -n 's@using version \(.*\) of the Cabal library@\1@p')