diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index f968841..6189b29 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -74,7 +74,7 @@ _spcd_banner_add() {
         else
             spcd_banner_open
         fi
-        spcd_banner_append \
+        _spcd_banner_append \
             "${spcd_ba__filler}" "${spcd_ba__text}" "${spcd_ba__filler}"
     fi
 }
@@ -95,7 +95,7 @@ _spcd_banner_add_index() {
     _spcd_banner_add "${spcd_bai__label}"
 }
 
-spcd_banner_append() {
+_spcd_banner_append() {
     if [ -n "${3}" ]; then
         SPCD_BANNER_TOP="${SPCD_BANNER_TOP}${1}"
         SPCD_BANNER_MIDDLE="${SPCD_BANNER_MIDDLE}${2}"
@@ -104,7 +104,7 @@ spcd_banner_append() {
 }
 
 spcd_banner_close() {
-    spcd_banner_append \
+    _spcd_banner_append \
         "${SPCD_BANNER_DOWN_AND_LEFT}" \
         "${SPCD_BANNER_VERTICAL}" \
         "${SPCD_BANNER_UP_AND_LEFT}"
@@ -118,7 +118,7 @@ ${SPCD_BANNER_BOTTOM}"
 }
 
 spcd_banner_open() {
-    spcd_banner_append \
+    _spcd_banner_append \
         "${SPCD_BANNER_DOWN_AND_RIGHT}" \
         "${SPCD_BANNER_VERTICAL}" \
         "${SPCD_BANNER_UP_AND_RIGHT}"
@@ -143,7 +143,7 @@ spcd_banner_render() {
 }
 
 spcd_banner_split() {
-    spcd_banner_append \
+    _spcd_banner_append \
         "${SPCD_BANNER_DOWN_AND_HORIZONTAL}" \
         "${SPCD_BANNER_VERTICAL}" \
         "${SPCD_BANNER_UP_AND_HORIZONTAL}"