diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 4e35398dd..1f68c29b7 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="19.0.0-1"
-export PIKA_PACKAGE_NAME="magnum"
+export PIKA_PACKAGE_VERSION="0.8.8+dfsg1-7"
+export PIKA_PACKAGE_NAME="python-ulmo"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"