diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 39c820a3f..0ae2820ee 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.2.15-1"
-export PIKA_PACKAGE_NAME="eperl"
+export PIKA_PACKAGE_VERSION="1.15~rc1-1"
+export PIKA_PACKAGE_NAME="lunzip"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"