diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index c7fc6ee12..653f20ad7 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.9-5"
-export PIKA_PACKAGE_NAME="python-pdbfixer"
+export PIKA_PACKAGE_VERSION="6.4.1-1"
+export PIKA_PACKAGE_NAME="muffin"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"