diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index b56811d25..6051527f0 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.0.0-1"
-export PIKA_PACKAGE_NAME="python-mastodon"
+export PIKA_PACKAGE_VERSION="1.3.1-4"
+export PIKA_PACKAGE_NAME="guile-fibers"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"