diff --git a/install_test_zsh.sh b/install_test_zsh.sh
index 40dc4c5..d3f3ba1 100755
--- a/install_test_zsh.sh
+++ b/install_test_zsh.sh
@@ -3,10 +3,10 @@
 set -ex
 
 for v in $(grep "^[^#]" ZSH_VERSIONS); do
-  mkdir zsh-$v
-  cd zsh-$v
+  mkdir "zsh-$v"
+  cd "zsh-$v"
 
-  curl -L https://api.github.com/repos/zsh-users/zsh/tarball/zsh-$v | tar xz --strip=1
+  curl -L "https://api.github.com/repos/zsh-users/zsh/tarball/zsh-$v" | tar xz --strip=1
 
   ./Util/preconfig
   ./configure --enable-pcre \
@@ -22,5 +22,5 @@ for v in $(grep "^[^#]" ZSH_VERSIONS); do
 
   cd ..
 
-  rm -rf zsh-$v
+  rm -rf "zsh-$v"
 done