diff --git a/build/config b/build/config
index 975e3b0..5071650 100644
--- a/build/config
+++ b/build/config
@@ -1,16 +1,19 @@
 export LC_ALL=C
 export DEBIAN_FRONTEND=noninteractive
 
-apt_install='apt-get install -y --no-install-recommends'
+apt_install() {
+    apt-get update
+    apt-get install -y --no-install-recommends "$@"
+}
 
 apt_install_permanent() {
     echo $@ | tr ' ' '\n' >> /build/permanent
-    $apt_install "$@"
+    apt_install "$@"
 }
 
 apt_install_temporary() {
     echo $@ | tr ' ' '\n' >> /build/temporary
-    $apt_install "$@"
+    apt_install "$@"
 }
 
 apt_remove() {