diff --git a/ingredients/copper b/ingredients/copper
index cae4db6..1c3cb60 100644
--- a/ingredients/copper
+++ b/ingredients/copper
@@ -57,7 +57,7 @@ configure_tor() {
 }
 
 get_external_ip() {
-    case $DISTRO in
+    case "$DISTRO" in
         "arch")
             install_if_needed dnsutils
             ;;