diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 174bbbb11..061bca8ef 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="12.5.1.14-1"
-export PIKA_PACKAGE_NAME="rtpengine"
+export PIKA_PACKAGE_VERSION="9.6.6-3"
+export PIKA_PACKAGE_NAME="ghc"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"