diff --git a/assets/installer.sh b/assets/installer.sh
index d3d6abd354177e9fda5f035ee22abd7b560bcb6f..324d3f3a3a739c9f1ada7b39f3a0e6ed02529399 100755
--- a/assets/installer.sh
+++ b/assets/installer.sh
@@ -81,7 +81,7 @@ pushd $1
   mkdir -p $1/voro++
   tar xvzf ./voro++-0.4.6.tar.gz -C $1/voro++ --strip-components 1
   cd voro++/
-  sed -i "21s|.*|PREFIX=${1}voro++|" ./config.mk
+  sed -i "21s|.*|PREFIX=${1}/voro++|" ./config.mk
   make
   make install
   cd ..