diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index 7261dfc..2af2a39 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -191,9 +191,9 @@ _spcd_os_cat() {
 # │ internal │ rule │
 # ╰──────────┴──────╯
 
-SPCD_RULE_HORIZONTAL="─"
-SPCD_RULE_LEFT="╴"
-SPCD_RULE_RIGHT="╶"
+_SPCD_RULE_HORIZONTAL="─"
+_SPCD_RULE_LEFT="╴"
+_SPCD_RULE_RIGHT="╶"
 
 # ╭──────────┬──────╮
 # │ internal │ step │
@@ -362,7 +362,7 @@ spcd_python_pip() {
 # ╰───────────┴───────╯
 
 spcd_split() {
-    echo "${SPCD_RULE_RIGHT}${SPCD_RULE_HORIZONTAL}${SPCD_RULE_LEFT}"
+    echo "${_SPCD_RULE_RIGHT}${_SPCD_RULE_HORIZONTAL}${_SPCD_RULE_LEFT}"
 }
 
 # ╭───────────┬──────╮