diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 5a47f5dff..daa1ade14 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="5.15.15-4"
-export PIKA_PACKAGE_NAME="qttools-opensource-src"
+export PIKA_PACKAGE_VERSION="4:24.08.3-1"
+export PIKA_PACKAGE_NAME="kalgebra"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"