diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 286893673..d7f5bab2a 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="6.9.1-1"
-export PIKA_PACKAGE_NAME="sip6"
+export PIKA_PACKAGE_VERSION="6.6.2.dfsg.1-9.1"
+export PIKA_PACKAGE_NAME="ncl"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"