diff --git a/sh/debian.sh b/sh/debian.sh
index 4485be6..7cc17e1 100644
--- a/sh/debian.sh
+++ b/sh/debian.sh
@@ -59,7 +59,7 @@ ${DEBIAN_CODENAME}-security main non-free-firmware contrib non-free
 " >"/etc/apt/sources.list"
 }
 
-apt_update() {
+sh_apt_update() {
 	apt-get \
 		update
 }
diff --git a/sh/rescue/common.sh b/sh/rescue/common.sh
index a9a08d7..200f839 100644
--- a/sh/rescue/common.sh
+++ b/sh/rescue/common.sh
@@ -17,7 +17,7 @@ fr_FR.UTF-8 UTF-8
 	# generate locales
 	locale-gen
 	# update catalog
-	apt_update
+	sh_apt_update
 	# disable frontend
 	sh_debian_frontend_disable
 	# install backports
@@ -25,12 +25,12 @@ fr_FR.UTF-8 UTF-8
 	# install packages
 	apt_install_release "apt-file" "mosh" "screen" "byobu"
 	# update catalog
-	apt_update
+	sh_apt_update
 }
 
 rescue_install() {
 	# update catalog
-	apt_update
+	sh_apt_update
 	# disable frontend
 	sh_debian_frontend_disable
 	# upgrade packages