diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index a5c5f22af..1d5828629 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="6.00.05-5"
-export PIKA_PACKAGE_NAME="irstlm"
+export PIKA_PACKAGE_VERSION="5.115.0-6"
+export PIKA_PACKAGE_NAME="purpose"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"