diff --git a/build.sh b/build.sh
index 07aea5c..4f99a55 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,6 @@
 #!/bin/bash -xe
 
+rm -rf ../geval
 git clone git://gonito.net/geval
 mv geval ..
 stack install