diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 24594f9a5..9cd89d8ac 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="6.6.0-1"
-export PIKA_PACKAGE_NAME="kf6-kcmutils"
+export PIKA_PACKAGE_VERSION="1:19.1.2-1"
+export PIKA_PACKAGE_NAME="llvm-toolchain-19"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"