diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 08a2aae62..699294b85 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.7.2-9.1"
-export PIKA_PACKAGE_NAME="netpipe"
+export PIKA_PACKAGE_VERSION="3.4.1-6"
+export PIKA_PACKAGE_NAME="pcalendar"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"