diff --git a/bin/list-all b/bin/list-all
index cea6e3d1133524d55a7d3ff5201e18741ba66564..958ec5b45937c9ac222a51ce3270a2918405f492 100755
--- a/bin/list-all
+++ b/bin/list-all
@@ -10,7 +10,7 @@ list_versions() {
 
   # This sed command was a quick and dirty solution to remove topaz-dev from
   # the version list, since it doesn't exist
-  "$(ruby_build_path)" --definitions | paste -sd " " - | sed "s|topaz-dev||g"
+  "$(ruby_build_path)" --definitions | grep -v "topaz-dev" | paste -sd " " -
 }
 
-list_versions
+list_versions 2> /dev/null
diff --git a/lib/utils.sh b/lib/utils.sh
index a273b57d186ecff724e475bcb79f229db385328c..545eb66f8128771e40ba7c2fcdd5f9d519deb50a 100644
--- a/lib/utils.sh
+++ b/lib/utils.sh
@@ -29,21 +29,24 @@ ensure_ruby_build_installed() {
 download_ruby_build() {
     # Print to stderr so asdf doesn't assume this string is a list of versions
     echo "Downloading ruby-build..." >&2
-    local build_dir="ruby-build-source"
+    local build_dir="$(asdf_ruby_plugin_path)/ruby-build-source"
 
     # Clone down and checkout the correct ruby-build version
     git clone https://github.com/rbenv/ruby-build.git $build_dir >&2 >/dev/null
     (cd $build_dir; git checkout $RUBY_BUILD_TAG >&2 >/dev/null)
 
     # Install in the ruby-build dir
-    PREFIX="$(ruby_build_dir)" ./$build_dir/install.sh
+    PREFIX="$(ruby_build_dir)" $build_dir/install.sh
 
     # Remove ruby-build source dir
     rm -rf $build_dir
 }
 
+asdf_ruby_plugin_path() {
+    echo "$(dirname "$(dirname "$0")")"
+}
 ruby_build_dir() {
-    echo "$(dirname "$(dirname "$0")")/ruby-build"
+    echo "$(asdf_ruby_plugin_path)/ruby-build"
 }
 ruby_build_path() {
     echo "$(ruby_build_dir)/bin/ruby-build"