diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index e73635c6d..438347ab9 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1:19.1.0~++rc4-4"
-export PIKA_PACKAGE_NAME="llvm-toolchain-19"
+export PIKA_PACKAGE_VERSION="0.13.72+dfsg.1-1.3"
+export PIKA_PACKAGE_NAME="zziplib"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b3"