diff --git a/tests/install_bash_unit.sh b/tests/install_bash_unit.sh
index d2d8f92..c97219d 100755
--- a/tests/install_bash_unit.sh
+++ b/tests/install_bash_unit.sh
@@ -4,7 +4,7 @@ install() {
     if [ -f "bash_unit" ]; then
         printf "bash_unit test framework exists\n"
     else
-        curl -o /tmp/install.sh -sLO $1
+        curl -o /tmp/install.sh -sLO "$1"
         chmod +x /tmp/install.sh
         /tmp/install.sh
     fi