diff --git a/cd.sh b/cd.sh
index 9496890..7cd5837 100644
--- a/cd.sh
+++ b/cd.sh
@@ -622,14 +622,14 @@ cd_echo () {
 
 cd_error_ci () {
     echo "× CI: ${*}"
-    exit ${CD_ERROR_CI}
+    exit "${CD_ERROR_CI}"
 }
 
 cd_error_os () {
     cd_error_os__variable="${1}"
     printf "× OS: "
     cd_echo "${cd_error_os__variable}"
-    exit ${CD_ERROR_OS}
+    exit "${CD_ERROR_OS}"
 }
 
 cd_grep_os () {