diff --git a/cd.sh b/cd.sh
index 5f31937..620e659 100644
--- a/cd.sh
+++ b/cd.sh
@@ -326,14 +326,14 @@ local name
 
 cd_error_ci () {
     echo "× CI: ${1}"
-    exit 1
+    exit ${CD_ERROR_CI}
 }
 
 cd_error_os () {
 local variable="${1}"
     echo -n "× OS: "
     cd_echo "${variable}"
-    exit 2
+    exit ${CD_ERROR_OS}
 }
 
 cd_grep_os () {
@@ -410,6 +410,9 @@ local text="${2}"
 
 # constants
 
+CD_ERROR_CI=2
+CD_ERROR_OS=1
+
 CD_OS_ALMA="alma"
 CD_OS_DEBIAN="debian"