diff --git a/build-iso-podman.sh b/build-iso-podman.sh
index 642d2bb..d6b6396 100755
--- a/build-iso-podman.sh
+++ b/build-iso-podman.sh
@@ -20,6 +20,9 @@ sudo podman run --rm --privileged --entrypoint sh \
   -e INITSYS=dinit \
   localhost/antergos-build:latest -c '
     set -euo pipefail
+    # Clear the image-layer pacman cache so a truncated/corrupt download
+    # (e.g. noto-fonts-emoji "Truncated tar archive") can never be reused.
+    pacman -Scc --noconfirm >/dev/null 2>&1 || true
     mkdir -p /var/lib/artools/buildiso
     mount -t tmpfs -o size=12G,exec,suid,dev tmpfs /var/lib/artools/buildiso
     modprobe loop 2>/dev/null || true