diff --git a/krebs/4lib/infest/prepare.sh b/krebs/4lib/infest/prepare.sh
index 8297ba1e6..182a068ef 100644
--- a/krebs/4lib/infest/prepare.sh
+++ b/krebs/4lib/infest/prepare.sh
@@ -47,6 +47,7 @@ prepare() {(
 )}
 
 prepare_arch() {
+  pacman -Sy
   type bzip2 2>/dev/null || pacman -S --noconfirm bzip2
   type git   2>/dev/null || pacman -S --noconfirm git
   type rsync 2>/dev/null || pacman -S --noconfirm rsync